The Hateful Eight: An Exploration of the evidence presented for Jeremy Hunt’s ‘Weekend Effect’ – UPDATED 13/1/15 with Stroke data

“We now have seven independent studies showing mortality is higher for patients admitted at weekends.”

You can view these seven (or rather eight) ‘studies’ here:

On the basis of this evidence Jeremy Hunt and the Department of Health have put forward the argument for sweeping changes to the NHS to create ‘Seven-Day’ services.

Juniordoctorblog deconstructs the Hateful Eight.

DISCLAIMER: this is written for a lay person. Further details on all the papers available on request.

1. Increased mortality associated with weekend hospital admission: a case for expanded 7 day services?  by Freemantle and Sir Bruce Keogh, published in the BMJ in 2015.

This is the most recent and most quoted paper, and where the soundbites “11,000 excess deaths” and “16% increased probability of death” come from. The study was performed by a group of researchers which included Sir Bruce Keogh, and was commissioned on his request, which makes the claim “independent” rather dubious. The study was an update of a 2012 paper (see below) and therefore 2 of the Hateful Eight are actually the same paper for different years.

This study pulled numbers from Hospital Episode Statistics, which records patient information from the discharge summaries written by junior doctors when you are discharged from hospital. If you have ever been to hospital you would know this is not always 100% accurate. The study identified the day of admission for every patient admitted to hospital in 2013/4, and then counted how many patients had died at 30 days after admission.

Overall just over 1.5 in 100 patients died in the study. They found patient deaths were LOWEST on Sunday, and HIGHEST on Wednesday, but for those ADMITTED on a Sunday or a Saturday they found a small increase in the risk of death at 30 days, an absolute increased risk of 0.07%* for admissions between Friday and Monday, compared to those admitted on a Wednesday.
The study also found 1/3 of patients died after being discharged from hospital, and the majority died after 7-8 days in hospital. For the first time the study tried to work out how sick patients were and found a higher proportion of the very sickest patients were entering the hospital on Saturday and Sunday compared to the weekdays. The authors conclude ‘to assume these excess deaths are avoidable would be rash and misleading’. At no point did this study measure staffing levels, rota cover or hospital resources, and the figure “11,000 excess deaths” is a statistical guess based on the numbers the study cranked out – they are NOT real identifiable cases.

BOTTOM LINE: Patients admitted at weekends are sicker, and they have a very tiny increased risk of death compared to the weekday admissions. “To assume this is avoidable is rash and misleading.”

2. Weekend hospitalisation and additional risk of death: an analysis of inpatient data by Freemantle/Sir Bruce Keogh published in 2012

This was the original paper as described above, by the same group from the same data using broadly the same methods. The only thing to add for this paper is it actually found patients in hospital on a Sunday were 8% less likely to die than those on a Wednesday.

BOTTOM LINE: 2 papers from the ‘Eight’ are written by Bruce Keogh of NHS England and are actually the same paper repeated.

3. The Global Comparators Project: international comparison of 30 day in-hospital mortality by day of the week by Ruiz, published in BMJ Quality and Safety 2015

The authors for this paper work for the Dr Foster Unit, sponsored by Dr Foster Intelligence: a former Department of Health co-owned patient safety monitoring company. They looked at the same data as the above from the Hospital Episode Statistics warehouse, and compared this to other countries: USA, Australia, the Netherlands and several more. This study looked at emergencies and routine surgery only for 2.8 million patients, 1.3 million of which came from the UK. For surgery, the UK had the lowest risk of death at 30 days. Emergency admissions were sicker than planned admissions. The results were similar for all countries studied, suggesting that this is an international phenomenon. UK planned surgery patients who had procedures on a Sunday, before adjustment**, were 0.7% more likely to die than those on a Monday. For emergency admissions the risk was 0.4% higher on a Sunday compared with a Monday. The effect was seen in nearly every country. Again this study performed no measurement of staffing levels on each day and the authors conclude themselves “we are not able to determine the reason for these findings.”
BOTTOM LINE: The ‘weekend effect’ is seen across the world in varying health systems.

Now is a good time to pause and discuss mortality. Imagine if you will two hospitals. Hospital A has a 90% mortality rate at 30 days – 90 in 100 people die within 30 days of admission, while at Hospital B the rate is only 2%, or only 2 in 100. Which would you rather be treated at? On the face of it, the answer would be Hospital B, because the obvious logic is: all illness should be curable, therefore I go to hospital to get better, therefore I choose the hospital where I have the greatest likelihood of getting better, ie not dying. Which makes sense: except if I told you Hospital A is a hospice, for end-of-life terminal cancer patients, and Hospital B is a community minor treatment unit for children, for scrapes and bruises and runny noses. Now this changes your perception of the figures: Hospital A has a surprisingly low mortality rate, considering everyone admitted is there to die peacefully, and Hospital B has a worringly high rate – considering no one should be dying at all. Now what if I told you Hospital C had a 1% chance of death for a procedure, and Hospital D had a 1.1% chance? Would you be bothered which hospital you went to? I wouldn’t. But if I told you that Hospital D had a 10% higher probability of death than Hospital C, you might change your mind. This illustrates the problem with superficially accepting statistics and why it’s so important to properly scrutinise the figures. Anyway, back to the papers.

4. East Midlands Clinical Senate (2014), 7 Day Services Project: Acute Collaborative Report

This is not a scientific report at all, but a consulting report from ATOS. The same ATOS that the Department for Work and Pensions recently dropped for the ‘poor quality of their work’. The report is from a group of executives from the East Midlands. It’s really dull, and not scientific at all – all of the numbers come from the other ‘studies’ here in regards to weekend and weekday working. Of 10 clinical standards for ‘seven-day’ services it found all were already being met 50-60% of the time. The biggest fail areas were ‘mental health’ and ‘transfer, discharge to social care’. Both budgets of which have been cut in the last ten years. However, here are some favourite quotes

“It is likely unsustainable and unnecessary for all trusts to provide all services 7 days a week”.

“There may be a need to drive funding for the whole system to deliver 7 day services”.

Here is a good time to remind readers the last eight years have been the worst funded decade for the NHS in its history (including the recently announced ‘extra’ £3 billion). Again no measure of staffing levels and no mention of junior doctors.

BOTTOM LINE: 7 day a week routine services require proper funding and are not necessary or sustainable in all areas. A good proportion of 7-day emergency services are already available.

5. NHS Services, 7 days a week report by NHS England/Sir Bruce Keogh

This is a policy document from NHS England and, again, Sir Bruce Keogh’s office. Also, again, not a scientific ‘study’ at all. Interestingly the focus is nearly entirely on emergency services – no mention of ‘routine’ care at all. The review notes that doctors and nurses are present on the acute medical unit 100% of the time weekday or weekend, the importance of diagnostic services being available 24/7, and lots of case studies- all of which achieved better cover without changing work conditions for staff. Interestingly in the annex it notes that many more weekend admissions are end-of-life patients compared to the weekdays- suggesting an increased need for community hospice and palliative care services.

BOTTOM LINE: Bruce Keogh and friends re-hash other research in this list- but importantly define the need for seven-day services as emergency care improvements, not routine services.

6. Academy of Medical Royal Colleges Report: 7 day consultant present care published in 2012

Again, not a unique scientific study but a review of many other studies. Produced by the Academy of Medical Royal Colleges to look into the necessity and feasibility of increasing consultant presence on the wards for emergency unscheduled patients. Again, not routine services and again, nothing about junior doctors or staffing levels.

BOTTOM LINE: Consultant presence is important for emergency admissions, not routine services.

 7. Weekend mortality for emergency admissions: a large multicentre study, BMJ Quality and Safety by Aylin published in 2010

Here is an ACTUAL scientific study, another from the Dr Foster Unit at Imperial College London (which was 50% part owned by the Dept of Health at the time of writing). This is the fourth study in this list that uses the Hospital Episode Statistics warehouse: again discharge letter information. This paper focused only on emergencies. They reached the same conclusion as the papers above, with an absolute increased risk of death at the weekend vs the weekday to be 0.12%*. They didn’t take into account how sick patients were, or their method of admission, and again no explicit measure of staffing levels were made.

BOTTOM LINE: A fourth study from the same data, showing a very small increased risk of death in weekend vs weekday emergency admissions, and no accounting for how sick patients were or staffing levels.

8. Time for training Report by Professor Sir John Temple from the Department of Health published in 2010.

Unfortunately this the original report has disappeared but in summary this was another policy document from the Dept of Health looking at the issue of training doctors under the European Working Time Directive. It’s main conclusions was that shift work is anti-social and has had an impact on training, and that consultants should be more involved in 24/7 work to support trainees.

BOTTOM LINE: Another non-study, suggesting a larger consultant presence day-to-day would help training. Nothing to do with the ‘weekend effect’.

I’d be remiss for not mentioning the latest papers in the ‘weekend effect’ argument, which haven’t quite made it onto the website yet but are already in the briefs and interviews of Mr Hunt and the spin machine.

9. Association between day of delivery and obstetric outcomes: observational study by Palmer, published in BMJ 2015

A fifth paper looking at Hospital Episode Statistics, and the third from the Dr Foster Unit. It is remarkable actually that no single paper has tried to analyse ‘the weekend effect’ in any other way than use the same source. This group tried to identify a weekend effect on seven different measurements associated with giving birth. Overall the stillbirth rate was 0.7%, or 7 in 1000. It actually finds that the stillbirth rate is significantly lower on Monday and Tuesday, which had

‘no association with staffing’.

BOTTOM LINE: No  link between mortality and staffing, and no obvious ‘weekend effect’ (Thursday had the highest rate of perinatal mortality.)

10. Mortality of emergency general surgical patients and associations with hospital structures and processes by Ozdemir published in the British Journal of Anaesthesia in 2016

This study unsurprisingly also used the Hospital Episode Statistics database, looking at all emergency admissions undergoing surgical procedures or admitted with pancreatitis over five years. The study then cross-referenced these numbers with data about the hospitals it was collected from – e.g. staffing levels, number of beds etc. The methodology in this paper was actually quite good, and they show a very strong association with the number of doctors, nurses and beds and the association with better surgical outcomes- of course this does generally reflect the amount of money a hospital has, and how well-resourced it is overall. The weekend data shows the same bump in mortality at the weekend as all the other studies that looked at the HES data, but didn’t measure weekend vs weekday staffing levels, as many media stories wrongly reported.

BOTTOM LINE: Increasing resources improves outcomes from emergency surgery, regardless of the day of the week.

UPDATE: Following the strike announcement Jeremy Hunt began quoting ‘you are 20% more likely to die from a stroke at the weekend’. Given how stupendously dangerous delaying presentation to hospital is for a stroke I’ve updated this post to add in the following; (Full credit to Prof David Curtis and Ben White for drawing this to public attention.)

11. Mortality following Stroke, the Weekend Effect and Related Factors: Record Linkage Study published on PloSOne in June 2015 by Roberts.

This was a study that took the Welsh equivalent Hospital Episode Statistics and looked specifically at patients who were admitted to hospital for a stroke between 2004-2012 and counted how many died at 7 days, 30 days and 1 year. They found less patients were admitted on a weekend for strokes (88) and patients admitted during the week (111), and a small increase in mortality of 1.8% at 7 days between weekend and weekday admissions. There are three really important things to say about this:

  • 1) The study notes – stroke mortality fell by 3.1% every year for the 8 years of the study. This reflects the radical improvement in stroke care that has occurred over the last twenty years with the introduction of ’emergency’ stroke pathways and hyperacute stroke units. Here is a nice graph. This study doesn’t really factor in this massive improvement in overall care, and isn’t relevant to today. Also – this improvement was done without changing working conditions for staff.Stroke trends
  • 2) Stroke occurs on any day with equal frequency except mondays– where it is slightly higher. Stroke can range from transient weakness or loss of vision which resolves after 24 hours, to permanent loss of power to limbs and face and even death. The authors note that the effect ‘may be influenced by a higher stroke severity threshold for admission on weekends’. If you look at day of stroke, regardless of admission, there is NO WEEKEND EFFECT, as seen here in a study from Japan.
  • 3) Stroke is defined as ‘maximal at onset’ – it represents sudden and complete blood loss to an area of the brain. There is only one main treatment, which is to give clot-busting medication. However- this is very dangerous and the list of situations where the risk of the treatment outweighs the benefit is very long. Having worked on-call in a stroke unit and ICU previously I have only seen one patient who met the criteria. Only 15% of strokes were treated this way in 2014. 60% of patients came to hospital too late for treatment. Stroke is now treated as an emergency – the ambulance calls a stroke-centre hospital before the patient arrives, and a specalist team sees the patient as soon as they come in to the door. The limiting factor now is when the patient dials 999.
  • 4) Lastly, a recent study found the presence of a consultant or doctor had no effect on a patients survival after stroke, whatever day of the week they were admitted. However, the presence of adequate nurses had a huge impact: increasing nursing numbers from 1.5 nurses/10 beds to 3 nurses/10 beds reduced mortality by 4%. This reflects the fact that stroke patients are very vulnerable in the immediate period after the event, and it’s good nursing care, not junior doctors, that directly influence this. However – Jeremy Hunt has so far suppressed the NICE recommended safe staffing levels for nurses- and the NHS student bursary to incentivise nursing training has been cut.

BOTTOM LINE: This study took place 12 years ago, in Wales, during a time of rapid improvement in stroke care overall. It shows a reduced number of strokes admitted on the weekend – and likely increased severity of those admissions resulting in a small 1.8% bump in mortality overall. Jeremy Hunt’s scaremongering has previously led patients to delay coming to hospital – in this particular case this could lead to devastating loss of function and even life. Time is the single biggest factor in survival in stroke, and has nothing to do with  weekend doctor staffing or junior contracts.

Now time to look at things differently. You hear a lot about the studies showing a ‘weekend effect’. But did you know there are many studies that show no effect? The fact that you don’t is an example of something called publication bias – the government only wishes you to think the ‘body’ of evidence all points one way. It doesn’t.

Here are some studies that show NO WEEKEND EFFECT.

Weekend mortality in paediatric patients in Scotland – published by the Royal College of Paediatrics, Turner 2015. [1]
Byun 2012 (small study compared to the others) [2]
Kazley 2010 (US study) [3]
Kevin 2010  (Canada) [4]
Myers 2009 (USA) [5]


  • Of the ‘Hateful Eight’ studies only four represent actual research
  • Two are the same paper and co-authored by Sir Bruce Keogh,
  • The other two are from Dr Foster, formerly owned by the Dept of Health.
  • All of the studies come from a single source of data.
  • None of them show any link to staffing levels, and none of them show any link to junior doctors working patterns.
  • Much research exists disputing the weekend effect
  • Research shows that increasing resources improves outcomes. Which is obvious.

And here is the pièce de résistance. When there is a finite amount of money the logical management of resource is to put money where it will do the most good. The National Institute for Health and Care Excellence, NICE, have a recommended money spent vs benefit formula for approving treatments. The cut off is currently about £20,000 to buy a year of quality life. This is how all new medications are decided if they are value for money or not.

Meacock in 2015 sat down and worked out the cost of a ‘seven day NHS’ and then tried to work out if NICE would approve if it were a medicine. Needless to say the money spent (estimated for emergency services to be £1-1.4 billion) is 2x-3x as much as the ‘recommended’ cut off.

BOTTOM LINE: This isn’t even good value for money.

Finally – some context. Every year in the UK 25,000 people will die of a blood clot to the lungs, 60,000 people will die of a heart attack, 30,000 people will die from chronic lung diseases, mostly smoking related. Improving research and treatment pathways for any of those conditions would save more lives than this endless politically driven ‘seven day’ debacle. I dread to think how much money has already been spent on the ‘seven-day’ services problem – but if it is real, it is a tiny relative problem and a problem no country anywhere has been able to solve.

All doctors would want to have the entire gamut of services on hand every day of the week – but the first lesson of practicing medicine is learning to prioritise. So far, the ‘studies’, simply don’t add anything useful to the debate – we need to know where and how to spend our money, whether that’s in the community, in social care, in improving hospice care, or in expanding emergency departments or increasing perioperative care. The list goes on. It’s not clear there is a truly avoidable ‘weekend effect’, but more importantly it’s not clear if it’s worth the vast amounts of money, damaging publicity, time and general consternation being spent on it.

This is a classic situation of political meddling in the NHS creating harm. We have a government and media who prefer soundbites to sound decision-making and spin doctors to actual doctors. THIS is the true threat to the safety of patients.




  1. Very good job. Also interesting to see that nearly half the references in the Fremantle 2015 paper are dead links (and were when it was published), and the others link to DoH research and each other

  2. Juiniordoctorblog is correct in suggesting that none of the “Hateful Eight” show any link to staffing levels, and none of them show any link to junior doctors’ working patterns. Data on staffing levels are difficult to find at the resolution of day of the week. Our work on obstetric care found no consistent relationship between consultant cover and weekend differences in outcome. Bray et al (2014, PLOS) found that mortality outcomes after stroke were associated with the weekend staffing by registered nurses but not weekend consultant ward rounds.

    I am not sure of the significance of the point about funding of the Dr Foster Unit at Imperial. Neither Dr Foster Intelligence nor Department of Health had any role to play in our choice to study the weekend effect, and had no input into the study designs, interpretation of our results or subsequent academic publications. If Juniordoctorblog made the point to suggest a political influence, then this entirely untrue. It should be noted that our emergency care paper (Aylin et al. 2010) was carried out and published during the last labour government.

    A couple of points of correction. Juniordoctorblog suggests that our emergency care paper (Aylin et al 2010) didn’t take into account how sick patients were, or their method of admission. Actually we did adjust for diagnosis, age, sex, deprivation quintile and comorbidity. The study also took account of method of admission. The title and methods are clear that it was based on emergency admissions only.

    Given Juniordoctorblog’s objection to using unpublished work (and indeed I share the objection) it is interesting that that one of the 5 studies provided as evidence for showing NO WEEKEND EFFECT at the end of the piece is unpublished (as far as I can tell). Of the remaining four, none are UK based (Korea, US and Canada). The studies are also relatively small and focus on specific populations (bleeding oesophageal varices, stroke, bloodstream infections). Juniordoctorblog also mentions a sixth study purportedly showing NO WEEKEND EFFECT, which is again based on a small sample (n=1,578) in Japan on stroke with very wide confidence intervals. The total number of subjects combined in these 5 published studies amount to just 3% (144,287/4,317,866) of the population studied in our original 2010 paper on emergency care. The studies are all relatively underpowered. To cite any of these studies as evidence of NO WEEKEND EFFECT in the UK seems slightly disingenuous, given Juniordoctorblog’s own concerns with publication bias. Juniordoctorblog’s references do raise an interesting point however, that the sample size required to demonstrate a “weekend effect” needs to be relative large. This is one reason for using national hospital administrative data, in that it is one of the few sources with enough records to demonstrate weekend effects.

    Following on from this, and to address Juniordoctorblog’s point about the relatively small attributable risk (or additional risk of death if admitted at the weekend on top of the background week day risk) by simply focusing on deaths, one might conclude we are talking about small numbers. Our estimate of 3000 deaths a year in our emergency admissions paper is not trivial (based numbers of deaths in patients admitted over the weekend, over and above that expected if the death rate on weekends were the same as on a week day). However, if one believes in the iceberg of disease, for every death there are many more patients with non-fatal conditions which could also be associated with weekend admissions. Indeed our paper on stroke (Palmer et al. 2012, Jama Neurology) not only found higher death rates in patients admitted at the weekend, but also found higher rates of aspiration pneumonia and lower rates of patients being discharge to their usual place of residence within 56 days (a sort of proxy measure for recovery).

    It is clear that there is bias on both sides of the argument in terms of the evidence and interpretation of that evidence. It is also clear that the picture is complicated. It is certainly good to look at the bigger picture, and there is a need for a comprehensive systematic review of the evidence. Readers should be wary though of bias (political or otherwise) in these types of reviews.

    1. Thank you Professor Aylin for your long and detailed commentary. We greatly value your input, it is always a great privilege to receive original authors comments on work posted here. A call for a comprehensive systematic review is warranted – but even more so is to move beyond statistical analysis and fund a properly powered root and cause analysis of case notes that would identify the deficient areas, if they exist, so we might properly address them
      Best wishes,

      1. In addition I was interested to read Prof Aylin’s comments on their own groups paper (Palmer 2010): [weekend stroke admission] worse rate of not only death but also aspiration pneumonia and less likely to go home to place of residence. Do these worse outcomes point to 1. Lack of junior doctors? And 2. Could these data not actually speak of severity? I would conclude that the second option is more plausible. On another note: age, co-morbidity and social index do not account for severity (yes they are likely to be correlated but will not 100% equal severity). This is not to say the authors of these papers are lazy, it’s just these severity scores don’t exist, say for a few CIRB-65 for community acquired pneumonia. A more balanced conclusion is therefore required.

      2. Hi Max,

        Just to be clear, we have never looked at junior doctor staffing in any of our papers, and have never claimed to. Our stroke paper was published in 2012 []. Stroke severity scores do exist (e.g. NIHSS), and certainly provide better predictors of outcomes than administrative data, but are not recorded on administrative records in the UK.

        Of interest, our paper also found that stroke patients admitted at the weekend were less likely to get a CT scan on the same day, and less likely to get thrombolysis. It is difficult to explain these findings, if stroke patients admitted at the weekend were more severely ill.


  3. As I sit here reviewing more recent papers, I’m puzzled why Juniordoctorblog decided to cite a Korean paper with only 292 patients with bleeding oesophageal varices in support of his/her argument of no weekend effect, while not mentioning a recent UK study by Robinson et al. (2015 BMJ Qual Saf) which included 27,700 UK patients with in-hospital cardiac arrest. This study used clinical audit data from the UK National Cardiac Arrest Audit (NCAA) with clinical risk adjustment to show significantly worse weekend and night time outcomes with a 28% lower chance of survival on weekend days compared with week days. The authors were unable to look at staffing levels, but do discuss possible reasons for their findings, in particular nursing staff levels. Whatever the explanation, they make a pretty strong case for the existence of an effect that is unlikely to be explained by casemix.

    See study here:

    1. The study mentioned above is very interesting- the reason it’s not part of the analysis is because it is not mentioned in the government briefing, and therefore not part of the Hateful Eight. This is not a comprehensive review of the weekend effect and nor should it be taken as such. The use of smaller studies to illustrate a lack of a ‘weekend’ effect is not meant to be an exercise in bias, but to demonstrate that there is a spectrum of research, and this is not mentioned in the black and white speeches of ministers for health.
      To return to the study Prof Aylin has brought up- it’s a little different to the other studies above which deal with the weekend as an admission cohort, but as an event cohort. Unlike many other papers, including the large Freemantle studies, which did not show a weekend effect for inpatients, cardiac arrests do appear to have significantly worse outcomes at night and at weekends compared with the weekday daytime.
      I Agree; this seems unlikely to be due to inadequate case mix adjustment- although the authors do note that patients with DNAR decisions were excluded, which could mean more weekday patients with clearly futile prognoses would be made not for resus at early review by their consultant, while weekend patients would not have that access. However- this seems unlikely to explain such a large effect.
      So what remains? The circadian distribution of rhythms seems very unlikely to reflect some hitherto undiscovered biological mechanism where non-shockable rhythms occur more frequently out of hours. The explanation that delay in identifying the arrested patient , with a greater proportion of previous shockable rhythms now deteriorated into non-shockable seems a good one. But does this mean care at the weekends is poorer?
      A major Confounder in this study would be the human habit of sleep. For cardiac arrest particularly identifying an arrested patient is complicated at night by the fact most patients are asleep, frequency of observations is reduced to facilitate this, and patients on hospital wards may draw the curtains, hide under blankets and generally avoid interaction with healthcare staff- all negative risk factors for unwitnessed arrest. This however does not explain the weekend daytime effect, which is relatively small but significant.
      Staffing levels, particularly of nurses, is likely an important factor. As the study calls for – a proper review of out of hours staffing and outcomes is warranted, but sorely missing. Some studies such as the 2014 Bray paper for stroke have found this effect for nurses in particular- very significant in the introduction and staffing of HASUs, which have since eliminated the weekend effect- at least in audits in London according to leading stroke physicians in a publicised letter in the Times a few weeks ago.
      We could assume that nursing levels are lower on the weekend rather than the weekday, but this is not always the case, and nationally what the bed/nurse ratio is at any given time I couldn’t tell you. I am unaware of any data that has detailed this .
      Finally are we actually looking at a reverse bystander effect? We know from out of hospital arrest data immediate bystander CPR can double or even triple survival.
      Rostered nurse observations of patients are one thing- but what about the whole host of weekday activity that increases the total Time a patient is observed compared to nights and the weekend- family visits, meal deliveries, phlebotomy attendance, routine radiology investigations, routine specialist reviews, social workers, physiotherapy and occupational therapy, pharmacists, domestic staff. All of these mean a patient may be observed nearly continuously during the daytime, less so at the weekend and even less so again at night time. Given the biggest factor in outcome appears to be delay in identifying the arrest, it would follow that the less time a patient is observed the more likely an unwitnessed deterioration and event might occur.
      As ever- these studies tell us there may be a problem, but only guess at what the problem might be. We need robust research into where the problems lie, so that we might begin to effectively address them.
      It is not and has never been the purpose of this blog to argue that there is no weekend effect. Only that the argument for the wholesale changes to the NHS are weakly evidenced in causation and may waste vast resources that causes more harm than the small benefits they aim to achieve.
      I hope that answers your question.

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