Age-adjusted baseline characteristics of participants by night-shift work duration in the NHS (women, at 1988).
Night-shift work duration | |||
---|---|---|---|
Characteristics | Never | 1–14 years | ≥15 years |
N of participants | 31,382 | 40,359 | 5,729 |
Age, yearsa | 54.7 (7.2) | 54.7 (7.1) | 54.8 (7.1) |
Race (White), % | 97.9 | 97.5 | 96.5 |
BMI, kg/m2 | 25.3 (4.8) | 25.6 (4.9) | 26.9 (5.5) |
Family history of colorectal cancer, % | 11.4 | 11.6 | 12.1 |
History of sigmoidoscopy/endoscopy, % | 12.4 | 12.6 | 11.4 |
Postmenopausal status, % | 72.1 | 72.5 | 76.0 |
Postmenopausal hormone use, % | 37.5 | 38.1 | 35.5 |
Total activity, METS—hours/week | 14.6 (20.8) | 16.0 (22.0) | 16.6 (24.0) |
Regular aspirin use (2 or more tablets/week), % | 39.3 | 40.9 | 42.6 |
Smoking status, % | |||
Never, % | 45.6 | 43.3 | 42.2 |
Smoking‚ pack-years 0–10, % | 16.8 | 17.4 | 14.4 |
Pack-years >10, % | 36.3 | 37.9 | 41.7 |
Total alcohol intake, g/day | 6.2 (10.6) | 6.3 (10.7) | 5.2 (10.3) |
Total vitamin D, IU/day | 341 (252) | 343 (253) | 337 (255) |
Total folate intake, μg/day | 403 (221) | 407 (224) | 395 (218) |
Total energy intake, kcal/day | 1,747 (519) | 1,782 (525) | 1,789 (556) |
Red meat, servings/week | 2.2 (1.4) | 2.2 (1.4) | 2.2 (1.4) |
Processed meat, servings/week | 1.0 (1.3) | 1.0 (1.3) | 1.1 (1.3) |
Total calcium intake, mg/day | 1,093 (514) | 1,088 (507) | 1,056 (508) |
Sleep duration, % | |||
Sleep <6 h, % | 3.1 | 3.8 | 8.4 |
Sleep 6 h–<7 h, % | 20.5 | 22.4 | 28.2 |
Sleep 7 h–<8 h, % | 50.2 | 49.5 | 44.0 |
Sleep 8 h–<9 h, % | 21.9 | 20.3 | 15.7 |
Sleep ≥9 h, % | 4.3 | 3.9 | 3.6 |
History of type II diabetes, % | 4.1 | 4.3 | 6.7 |
Note: Values were means ± SD or percentages and were standardized to the age distribution of the study population.
Abbreviation: METS, metabolic equivalent task score.
↵aValue was not age adjusted.