Demographic, clinical characteristics of daytime workers and night-shift workers
| Daytime workers (n = 336) | Night-shift workers (n = 402) | |
| Mean (SD) age, years | 37.9 (8.5) | 38.9 (8.4) |
| Male sex, n (%) | 92 (27.5) | 124 (30.9) |
| Current smokers, n (%) | 91 (27.1) | 119 (29.7) |
| Alcohol drinkers,* n (%) | 67 (20.0) | 72 (17.9) |
| Mean (SD) waist circumference, cm | 79.2 (9.3) | 80.4 (9.7) |
| Positive familiar history,† n (%) | 102 (30.4) | 138 (34.3) |
| Sedentariness, n (%) | 255 (77.1) | 318 (79.1) |
*More than 30 g/day.
†A positive familiar history refers to obesity, hypertension, hyperlipidaemia, diabetes, overt ischaemic cardiovascular disease, or a combination of the above.