Table 2.
Working and sleep characteristics according to work schedules
| Permanent day workers (n=1905) | Day shift workers (n=220) |
Night shift workers (n=134) |
Permanent night workers (n=42) | p-value | N total | |
| Working characteristics | ||||||
| Number of working hours/week | 38.0±14.7 | 38.7±15.2 | 43.1±18.1 | 38.0±15.2 | 0.260 | 2285 |
| Work time, n (%) | 0.397 | 2258 | ||||
| Full-time | 1569 (83.8) | 181 (84.6) | 111 (86.0) | 39 (92.9) | ||
| <50% | 304 (16.2) | 33 (15.4) | 18 (14.0) | 3 (7.1) | ||
| Example of physical intensity at work, n (%) | <0.001 | 2135 | ||||
| Sedentary (sitting/driving) | 1409 (79.5) | 105 (51.2) | 66 (55.0) | 14 (37.8) | ||
| Pushing wheelbarrow | 283 (16.0) | 81 (39.5) | 40 (33.3) | 16 (43.2) | ||
| Unloading a truck without assist. | 81 (4.6) | 19 (9.3) | 14 (11.7) | 7 (18.9) | ||
| Sleep and vigilance | ||||||
| Epworth Sleepiness Scale score | 6 (4–8) | 5 (3–8) | 6 (4–9) | 5 (3–8) | 0.623 | 1786 |
| Excessive daytime sleepiness, n (%)* | 182 (12.1) | 20 (12.6) | 14 (14.0) | 3 (11.1) | 0.950 | 1786 |
| Poor sleep quality, n (%)† | 415 (31.5) | 46 (37.4) | 27 (32.1) | 7 (35.0) | 0.600 | 1542 |
| High risk of SDB, n (%)‡ | 321 (21.3) | 34 (21.0) | 29 (28.4) | 8 (27.6) | 0.323 | 1800 |
| Self-reported total sleep time (hour) | 6.9±1.0 | 6.8±0.9 | 6.9±1.0 | 7.1±1.3 | 0.507 | 1542 |
Data are presented as mean±SD or median and IQR for continuous variables and number of participants (%) for categorical variables. P-value<0.05 are shown in bold.
*Excessive daytime sleepiness was defined by an Epworth Sleepiness Scale score >10.
†Poor sleep quality was defined by a Pittsburgh Sleep Quality Index score >5.
‡High risk of SDB was defined by a Berlin score >2.
SDB, sleep-disordered breathing.