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. Author manuscript; available in PMC: 2019 Sep 7.
Published in final edited form as: N Engl J Med. 2019 Mar 7;380(10):915–923. doi: 10.1056/NEJMoa1810641

Figure 2. Different Shift Types in Standard and Flexible Programs.

Figure 2.

Gray bars depict typical work periods for the different shift types in standard and flexible programs. Interns were instructed to take the survey and PVT-B between 6 a.m. and 9 a.m. every day. An extended overnight shift in flexible programs spanned across 2 days. The work period started in the morning of day 1 and concluded at approximately noon on day 2. In this shift, the survey and PVT-B were administered once at the beginning of the shift on day 1 and a second time 24 hours later close to the end of the shift on day 2. The actual placement and duration of shifts in standard and flexible programs may have differed for individual programs.