Table 1

Demographic characteristics of the study sample

Baseline characteristics2002–2007
N=5485
2014–2017
N=9311
P value
Age28.9±3.928.7±3.2
Female gender n (%)3106 (57%)4514 (48%)
 Unknown31 (1%)634 (7%)
Specialty n (%)*
 Internal medicine1366 (24%)2358 (25%)
 Family practice643 (11%)1125 (12%)
 Paediatrics790 (14%)1080 (11%)
 General surgery and surgical specialties643 (11%)934 (10%)
 Emergency medicine369 (7%)687 (7%)
 Obstetrics/Gynaecology364 (6%)509 (5%)
 Psychiatry251 (4%)422 (4%)
 Anaesthesiology30 (1%)430 (4%)
 Other (including combined)1129 (20%)1402 (15%)
 Unknown95 (2%)649 (7%)
University-based programme n (%)3643 (66%)5661 (61%)
Monthly characteristicsN=30 155N=47 946
Weekly work hours71.1±18.462.1±16.9<0.001
Hours engaged in patient care49.6±19.649.3±19.30.40
Additional weekly work hours related to programme3.7±4.25.0±6.3<0.001
Extended duration shifts per month4.0±3.40.2±1.2<0.001
Nightly sleep duration6.47±1.26.73±1.1<0.001
Sleep duration on extended duration shifts2.52±1.51.87±1.8<0.001
Proportion of extended duration shifts without sleep0.08±0.270.29±0.46<0.001
Perceived stress4.5±1.64.5±1.60.99
  • Plus-minus values are means±SD. Unadjusted generalised linear regression models adjusted for clustering of individual responses were used to compare monthly characteristics. Created by the authors.

  • *Column percentages may not add to 100% due to rounding.