TABLE 4

Physical Stress and Rest

Category2005 OlderP (Overall)Early 2009Late 2009P (Early vs Late 2009)
Distance walked (IQR), km7.30 (3.86–8.91)<.00018.16 (6.86–10.37)5.24 (3.86–6.66)<.0001
Non-sleep rest (IQR), min60 (30–105).03340 (5–80)45 (10–60).792
Eating (IQR), minNA.95540 (30–60)42 (25–60).955
Beverages consumed, n (IQR)NA.7702 (1–3)2 (1–3).770
Start-duty ketonuria, n (%)2 (7.41).2680 (0%)1 (3.7).422
End-duty ketonuria, n (%)5 (8.2).1952 (3.6%)1 (1.6).595
Sleep (IQR), min
    Total267 (130–476).047156 (100–234)197 (150–321).043
    Weekends and holidays310.5 (160–562).345242 (127–290)197 (135–305).808
    Regular days241 (107–464).066141 (92–210)213 (158–321).017
    Senior residents399 (203–562).003126 (92–129)277 (219–357).020
    Junior residents157 (79–340).752187 (117.5–247)175 (149–321).553
  • The nature and duration of clinical activities performed during 180 on-call duty periods by 51 pediatric residents. Objective measurements of sleep were obtained in 76 (42.2%) duty periods. The median (IQR) duration of sleep was 200 (126–330) min, and the mean duration of sleep was 243 min. There were 3 shifts with no sleep: 2 (6.3%) in the 2005 era and 1 (4%) in the 2009 era before duty-hour reduction (P = .7838). There were 3 shifts with no sleep: 2 (6.3%) in the 2005 era and 1 (4%) in the 2009 era before duty-hour reduction (P = .7838). Ketone measurements were obtained in 27 duty periods in 2005, 37 duty periods in early 2009, and 27 duty periods after duty-hour reduction.