Table 1.
Age and age adjusted characteristics of participants according to duration of rotating night shift work at baseline. Values are numbers (percentages) unless stated otherwise
| Characteristics | Duration of rotating night shift work (years) | |||
|---|---|---|---|---|
| Never | 1-5 | 5-9 | ≥10 | |
| Nurses’ Health Study 1988 (n=55 324) | ||||
| Total | 22 603 (41) | 23 008 (42) | 3677 (7) | 6036 (11) |
| Mean (SD) age, years | 53.4 (7.1) | 53.7 (7.1) | 54.5 (7.0) | 55.5 (6.9) |
| Mean (SD) body mass index | 25.1 (4.6) | 25.2 (4.6) | 25.8 (5.0) | 26.4 (5.1) |
| Mean (SD) total energy intake, kcal/day | 1751 (520) | 1788 (523) | 1777 (540) | 1787 (546) |
| Mean (SD) Alternate Healthy Eating Index | 45.9 (10.5) | 46.3 (10.5) | 46.3 (10.5) | 45.5 (10.1) |
| Mean (SD) alcohol intake, g/day | 6.2 (10.7) | 6.4 (10.6) | 6.0 (10.5) | 5.4 (10.2) |
| Mean (SD) moderate to vigorous intensity exercise, h/week | 1.9 (3.3) | 2.2 (3.5) | 2.0 (3.3) | 2.1 (3.6) |
| White ethnicity | 22 151 (98) | 22 548 (98) | 3603 (98) | 5855 (97) |
| Current smoker | 3843 (17) | 3911 (17) | 772 (21) | 1388 (23) |
| Married | 16 726 (74) | 17 026 (74) | 2611 (71) | 4165 (69) |
| Living alone | 2260 (10) | 2301 (10) | 404 (11) | 724 (12) |
| Postmenopausal | 15 822 (70) | 16 106 (70) | 2611 (71) | 4467 (74) |
| Family history of diabetes | 6329 (28) | 6672 (29) | 1140 (31) | 1871 (31) |
| Nurses’ Health Study II 1991 (n=88 086) | ||||
| Total | 30 100 (34) | 44 720 (51) | 8242 (9) | 5024 (6) |
| Mean (SD) age, years | 36.3 (4.7) | 35.9 (4.7) | 35.9 (4.5) | 37.7 (3.9) |
| Mean (SD) body mass index | 24.2 (5.0) | 24.4 (5.2) | 25.2 (5.7) | 25.9 (6.0) |
| Mean (SD) total energy intake, kcal/day | 1765 (536) | 1794 (548) | 1803 (560) | 1828 (576) |
| Mean (SD) Alternate Healthy Eating Index | 43.6 (10.5) | 44.3 (10.5) | 44.1 (10.4) | 43.3 (10.5) |
| Mean (SD) alcohol intake, g/day | 3.0 (6.0) | 3.3 (6.2) | 3.2 (6.0) | 2.9 (5.8) |
| Mean (SD) moderate to vigorous intensity exercise, h/week | 2.2 (3.5) | 2.4 (3.8) | 2.6 (3.9) | 2.6 (4.1) |
| White ethnicity | 28 896 (96) | 42 931 (96) | 7830 (95) | 4773 (95) |
| Current smoker | 3311 (11) | 5366 (12) | 1154 (14) | 854 (17) |
| Married | 24 381 (81) | 34 882 (78) | 5934 (72) | 3567 (71) |
| Living alone | 2107 (7) | 3578 (8) | 824 (10) | 603 (12) |
| Postmenopausal | 903 (3) | 1342 (3) | 247 (3) | 201 (4) |
| Family history of diabetes | 4515 (15) | 7155 (16) | 1401 (17) | 955 (19) |
All variables except age are age standardized.