What events are these?
Yes, the pattern is related to the work week.
But it is not the numbers of heart attacks brought on by
the stress of going to work, or the numbers of motor vehicle accidents.
Nor is it the numbers who turn on an appliance, or take a shower.
Remember again, the numbers do not diminish after the end of the workday.
And there is very little seasonal variation.
Since 2000, the numbers of events have fluctuated around 4 million per year.
The preliminary number for the United States in 2014 was 3.99 million,
an increase of 1% from 2013 (3.93 million).
This is the first increase since 2007, ending the recent downward trend.
The number declined steadily from 2007 through 2010,
but the pace of decline slowed from 2010 through 2013.
Japan has published data going back to 1996, but at a 60-minute rather than a 1-minure resolution.
This graph, made from some of these data, stacks the
days of the week in columns rather than rows,
scales the events rates to a common mean of 100%,
and displays the percentage deviations from this.
The overall event rate in Japan has declined considerable over the last half-century.
ADDITIONAL CLUES
Third (others are be found within this link)
James Hanley james.hanley@mcgill.ca
http://www.biostat.mcgill.ca/hanley
Dept of Epidemiology, Biostatistics and Occupational Health
Faculty of Medicine, McGill University, Montreal, H3A 1A2, CANADA
Updated: September 30, 2015