Table 1.
Demographic characteristics of the study population for morning, night, 8-h rotating (8-h R) and 12-h rotating (12-h R) shift workers. The final column shows the F-ratio and degrees of freedom (df = 3113) from the univariate ANOVA.
| Morning n = 33 | Night n = 27 | 8-h R n = 29 | 12-h R n = 29 | F3113 | |
|---|---|---|---|---|---|
| Demographics | |||||
| Age (years) | 44.8 (9.9) | 42.7 (9.9) | 41.2 (11.7) | 44.17 (7.9) | 0.58 |
| Female (%) | 21.2 | 37.0 | 65.5 | 3.6 | |
| BMI (kg/m2) | 25.8 (2.8) | 26.8 (5.1) | 27.5 (5.5) | 28.3 (4.0) | 1.68 |
| Married (%) | 81.8 | 74.1 | 85.7 | 93.1 | |
| Education | |||||
| Postgrad (%) | 12.5 | 7.4 | 32.1 | 17.2 | |
| Undergrad (%) | 21.9 | 14.8 | 32.1 | 3.4 | |
| Vocational (%) | 21.9 | 7.4 | 14.3 | 44.8 | |
| Secondary (%) | 43.8 | 70.4 | 21.4 | 34.5 | |
| Sleep/Fatigue | |||||
| Sleep duration (h) | 7.5 (1.0) | 7.0 (1.1) | 7.4 (0.9) | 6.3 (1.0) | 8.42 *,a |
| Chronic Fatigue (10–50) | 25.9 (5.9) | 28.1(8.4) | 28.0 (7.8) | 25.1 (7.7) | 1.42 |
| Work | |||||
| Work hours (h) | 40.4 (16.1) | 35.9 (9.6) | 38.9 (10.0) | 44.0 (7.2) | 2.44 |
| Shift work (years) | 18.7 (11.5) | 9.0 (5.9) | 13.5 (10.5) | 18.5 (8.8) | 6.37 *,b |
| Industry | |||||
| Printing (%) | 18.2 | 14.8 | 20.7 | 0 | |
| Postal (%) | 63.6 | 77.8 | 0 | 0 | |
| Nursing (%) | 15.2 | 7.4 | 75.9 | 0 | |
| Oil and Gas (%) | 3 | 0 | 3.4 | 100 | |
Mean (standard deviation) unless indicated otherwise; * significant at p < 0.05; R = rotating; BMI = body mass index; a 12-h R sleep duration was significantly shorter compared to all other shift types; b 12-h R spent significantly longer years in shift work compared to night and 8-R shift workers.