Table 1. Characteristics of participants according to the combination category of WWHs and DSD.
| WWHs DSD |
<80 h≥6 h |
≥80 h ≥6 h |
<80 h <6 h |
≥80 h <6 h |
p-valuea |
|---|---|---|---|---|---|
| N (M/F) | 118 (100/18) | 25 (18/7) | 59 (51/8) | 30 (26/4) | |
| Age, yrb | 41.0 (8.9) | 38.8 (9.8) | 42.6 (8.4) | 39.3 (8.7) | 0.17 |
| Work week, hb | 57.2 (9.4) | 84.3 (6.2) | 62.0 (9.9) | 86.6 (6.7) | <0.01 |
| Sleeping duration, hb | 6.4 (0.6) | 6.3 (0.7) | 5.0 (0.5) | 4.9 (0.4) | <0.01 |
| postgraduate years, yrb | 15.3 (8.7) | 13.8 (10.0) | 17.6 (8.7) | 13.8 (8.2) | 0.13 |
| University-based hospital, n (%) | 59 (50.0) | 12 (48.0) | 38 (64.4) | 27 (90.0) | <0.01 |
| Psychological and physical stress reactions score, pointsb | 20.5 (4.3) | 19.8 (4.1) | 18.5 (4.1) | 17.7 (4.8) | <0.01 |
| CES-D, pointsb | 9.1 (6.5) | 9.6 (6.2) | 11.3 (9.1) | 13.0 (9.6) | 0.27 |
aKruskal–Wallis test for continuous variables and χ2 test for categorical variables.
bData is shown as mean (standard deviation).
CES-D: Center for Epidemiologic Studies Depression; DSD: daily sleep duration; M/F: Male/Female; WWHs: weekly working hours.