Table 3.
Association of night shift work with incidence of type 2 diabetes by obesity and age in the Black Women's Health Study, 2005-2013
| Night shift work (years) | Trend test | Ever worked night shift | ||||
|---|---|---|---|---|---|---|
| Never | 1 – 2 years | 3 – 9 years | 10+ years | P-value | HR (95% CI) | |
| Non-Obese | ||||||
| Cases/Person-years | 333/73,933 | 125/21,472 | 48/10,993 | 32/4,325 | 205/36,790 | |
| Multivariate Modela | 1.00 (reference) | 1.17 (0.95,1.45) | 0.81 (0.60,1.10) | 1.16 (0.80,1.68) | 0.79 | 1.06 (0.89,1.27) |
| Obese | ||||||
| Cases/Person-years | 653/45,405 | 261/17,054 | 174/9,439 | 98/4,364 | 533/30,857 | |
| Multivariate Modela | 1.00 (reference) | 1.05 (0.91,1.21) | 1.20 (1.01,1.42) | 1.23 (0.99,1.53) | 0.029 | 1.12 (1.00,1.26) |
| < 50 years | ||||||
| Cases/Person-years | 339/62,394 | 163/21,205 | 100/10,433 | 40/3,253 | 303/34,891 | |
| Multivariate Modela | 1.00 (reference) | 1.19 (0.99,1.44) | 1.38 (1.10,1.73) | 1.39 (0.99,1.94) | 0.012 | 1.27 (1.09,1.49) |
| ≥ 50 years | ||||||
| Cases/Person-years | 675/58,505 | 236/17,890 | 135/10,384 | 98/5,646 | 469/33,921 | |
| Multivariate Modela | 1.00 (reference) | 1.02 (0.88,1.18) | 0.97 (0.80,1.16) | 1.17 (0.94,1.45) | 0.20 | 1.03 (0.91,1.16) |
a
Adjusted for age, questionnaire cycle, family history of diabetes, education, neighborhood socioeconomic status, body mass index (continuous in the obesity-stratified analysis, and categorical in the age-stratified analysis), and lifestyle factors (vigorous activity levels, smoking, alcohol, energy intake, dietary pattern, and coffee, decaffeinated coffee, soda consumption, and diet soda consumption)