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It showed an obvious weekend effect in the industry's snow reports.
The data in the study did not allow the authors to describe the cause of this so-called weekend effect.
Professor Coiera said most people were surprised the weekend effect exists at all.
However, this delay did not seem to be the reason for the weekend effect on mortality, Shaheen's team states.
This is not the first study to uncover a "weekend effect," in which patients are likely to fare worse during the weekends.
In other cases, including forms of cancer, the "weekend effect" is likely caused because sicker people are turning up after regular hours.
Some researchers say this so-called weekend effect has to do with less-aggressive care and hospital staffing changes.
The weekend effect, Mr. Wood said, was a little surprising.
Plus, other papers have described the "weekend effect."
Other departments typically have fewer doctors on hand overnight and on the weekends, which is one of the reasons for the weekend effect.
The Nasa study found that the "weekend effect" in the rain cycle only became strong enough to be detectable in the 1980s.
In general, "I am impressed as to how many good, large studies across multiple countries show a small but consistent weekend effect for stroke," Reeves noted.
In addition, other types of counseling services, including telephone hotlines, should take this "weekend effect" into account and increase their capacity on Mondays, the researchers said.
The weekend effect shows up in the data as early as 1987 to 1990, when angioplasty was almost never used to save the lives of heart attack patients.
"The results are consistent with previous studies in the U.S., which have suggested a weekend effect in stroke care," said Palmer.
The BMJ paper did highlight a lack of senior doctors and support services available in hospitals at weekends as causes of the "weekend effect".
The new study focused on metastatic prostate cancer in examining the so-called "weekend effect" of higher patient mortality, subject of numerous studies for about a decade.
The weekend effect drops to zero where the iPhone is heavily used, said economist Eric Zitzewitz at Dartmouth.
The weekend effect is an area of particular concern in the National Health Service, and has often been attributed to a shortage of consultants working at weekends.
In response to this "weekend effect" and the lack of seven day elective services, there have been proposals for major reform to contracts of NHS staff.
The weekend effect also occurs in patients with some types of cancer, the study, published in the journal BMJ Quality and Safety, revealed.
In an accompanying editorial, doctors from the Mount Sinai Hospital in Toronto say that reassuringly, the "weekend effect" is not due to reduced staffing levels.
The so-called "weekend effects" in snow reporting were larger for resorts with more expert terrain and within closer driving distance to populated areas, Zinman and Zitzewitz said.
But that weekend effect was limited to hospitals that were not comprehensive stroke centers and therefore not able to deliver a full spectrum of care to stroke patients.
NHS medical director Sir Bruce Keogh, a respected cardiologist, says there is a 'moral and professional case for concerted action' to tackle 'an avoidable weekend effect'.