Fig. 1: Duty hours per week of 9 senior fellows working in a tertiary pediatric critical care unit. Two 4-week blocks, totalling 48 rostered weeks, are represented. The bars reflect the number of hours worked per week for the number of weeks noted. For example, the first bar demonstrates that the fellows worked 55 hours per week for 11 of the 48 weeks; the last bar shows that 105 hours were worked per week for 2 of the 48 weeks.