Table 1 Basic characteristics of the study population
Characteristics | Night shift workers (n = 3008) | Day workers (n = 8015) | Overall | p value |
|---|---|---|---|---|
Age (mean ± SD, y) | 47.5 ± 3.5 | 49.4 ± 4.9 | 48.9 ± 4.7 |  < 0.001 |
Working years(mean ± SD, y) | 28.6 ± 4.2 | 30.5 ± 5.7 | 30.0 ± 5.4 |  < 0.001 |
BMI (mean ± SD, kg/m2) | 25.2 ± 3.1 | 24.8 ± 3.1 | 24.9 ± 3.1 |  < 0.001 |
Hip circumference (mean ± SD, cm) | 96.1 ± 6.3 | 95.6 ± 6.1 | 95.7 ± 6.1 | 0.024 |
Smoking status (n, %) | Â | Â | Â | 0.599 |
Current smoker | 1973 (65.6) | 5250 (65.5) | 7223 (65.5) | Â |
Former smoker | 263 (8.7) | 659 (8.2) | 922 (8.4) | Â |
Never-smoker | 772 (25.7) | 2106 (26.3) | 2878 (26.1) | Â |
Alcohol consumption (n, %) |  |  |  |  < 0.001 |
Current drinker | 542 (18.0) | 1980 (24.7) | 2522 (22.9) | Â |
Former drinker | 46 (1.5) | 191 (2.4) | 237 (2.2) | Â |
Never-drinker | 2420 (80.5) | 5844 (72.9) | 8264 (75.0) | Â |
HBP (n, %) | 579 (19.2) | 1728 (21.6) | 2307 (20.9) | 0.008 |
DM (n, %) | 205 (6.8) | 710 (8.9) | 915 (8.3) | 0.001 |
CAD (n, %) | 12 (0.4) | 98 (1.2) | 110 (1.0) |  < 0.001 |
SBP (mmHg) | 126.7 ± 15.0 | 127.7 ± 16.5 | 127.4 ± 16.1 |  < 0.001 |
DBP (mmHg) | 85.1 ± 11.9 | 83.8 ± 8.3 | 84.7 ± 11.7 |  < 0.001 |
TC (mmol/L) | 5.1 ± 0.9 | 5.1 ± 0.9 | 5.1 ± 1.0 | 0.051 |
TG (mmol/L) | 2.3 ± 2.1 | 2.3 ± 2.0 | 2.3 ± 2.1 | 0.693 |
LDL (mmol/L) | 3.1 ± 0.7 | 3.1 ± 0.7 | 3.1 ± 0.7 | 0.478 |
HDL (mmol/L) | 1.2 ± 0.3 | 1.3 ± 0.3 | 1.3 ± 0.3 |  < 0.001 |
hsCRP (mg/l) | 2.4 ± 3.4 | 2.6 ± 4.3 | 2.5 ± 4.1 | 0.095 |
FBG (mmol/L) | 5.9 ± 1.7 | 6.0 ± 1.0 | 6.0 ± 1.9 |  < 0.001 |
ALT (U/L) | 31.1 ± 17.1 | 30.2 ± 17.4 | 30.5 ± 17.4 | 0.019 |
Cr (μmol/L) | 75.0 ± 13.2 | 73.8 ± 13.6 | 74.1 ± 13.5 |  < 0.001 |
UA (mmol/L) | 394.8 ± 81.1 | 391.0 ± 83.5 | 392.0 ± 82.9 | 0.032 |