Table 1.
Baseline participant characteristics by sleep duration categories
| Sleep Duration | ||||
|---|---|---|---|---|
| Missing | <7 hours | 7-<9 hours | ≥9hours | |
| Number of participants | 3,630 | 116,835 | 319,223 | 35,598 |
| Variable | Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) |
| Age (years) | 57.2 (8.2) | 56.7 (7.9) | 56.7 (8.2) | 58.8 (8.1) |
| Follow-up Time (Years) | 10.3 (2.4) | 10.5 (2.2) | 10.5 (2.2) | 10.3 (2.5) |
| n (%) | n (%) | n (%) | n (%) | |
| Sex | ||||
| Men | 1,387 (38.2) | 55,214 (47.3) | 146,881 (46.0) | 15,664 (44.0) |
| Women | 2,243 (61.8) | 61,621 (52.7) | 172,342 (54.0) | 19,934 (56.0) |
| Race | ||||
| Missing participants | 678 (18.7) | 519 (0.44) | 980 (0.3) | 144 (0.4) |
| Asian participants | 144 (4.0) | 3,342 (2.9) | 6,814 (2.1) | 866 (2.4) |
| Black participants | 220 (6.1) | 3,505 (3.0) | 3,592 (1.1) | 469 (1.3) |
| Mixed-race participants | 31 (0.9) | 949 (0.8) | 1,649 (0.5) | 208 (0.6) |
| Other participants | 90 (2.5) | 1,524 (1.3) | 2,471 (0.8) | 318 (0.9) |
| White participants | 2,467 (68.0) | 106,996 (91.6) | 303,717 (95.1) | 33,593 (94.4) |
| BMI (kg/m 2 ) | ||||
| Missing | 67 (1.9) | 700 (0.6) | 1,323 (0.4) | 268 (0.8) |
| <25.0 | 944 (26.0) | 33,882 (29.0) | 108,887 (34.1) | 9,873 (27.7) |
| 25.0 - <30.0 | 1,349 (37.2) | 48,488 (41.5) | 137,573 (43.1) | 14,805 (41.6) |
| 30.0 - <35.0 | 794 (21.9) | 23,239 (19.9) | 52,549 (16.5) | 7,259 (20.4) |
| 35.0 - <40.0 | 305 (8.4) | 7,325 (6.3) | 13,957 (4.4) | 2,381 (6.7) |
| ≥40 | 171 (4.7) | 3,201 (2.7) | 4,934 (1.6) | 1,012 (2.8) |
| Diabetes Status | ||||
| Missing | 709 (19.5) | 489 (0.4) | 807 (0.3) | 166 (0.5) |
| Yes | 327 (9.0) | 6,908 (5.9) | 14,399 (4.5) | 3,136 (8.8) |
| No | 2,594 (71.5) | 109,438 (93.7) | 304,017 (95.2) | 32,296 (90.7) |
| Alcohol Intake | ||||
| Missing | 746 (20.6) | 221 (0.2) | 357 (0.1) | 54 (0.2) |
| Never | 346 (9.5) | 6,256 (5.4) | 12,489 (3.9) | 2,047 (5.8) |
| Former | 248 (6.8) | 5,175 (4.4) | 9,636 (3.0) | 1,858 (5.2) |
| Current drinker, infrequent (<3x/month) | 994 (27.4) | 29,194 (25.0) | 68,270 (21.4) | 8,900 (25.0) |
| Current drinker, <1 drink/day | 645 (17.8) | 26,856 (23.0) | 82,463 (25.8) | 7,848 (22.1) |
| Current drinker, 1–3 drink/day | 543 (15.0) | 38,924 (33.3) | 119,835 (37.5) | 11,275 (31.7) |
| Current drinker, >3 drink/day | 108 (3.0) | 10,209 (8.7) | 26,173 (8.2) | 3,616 (10.2) |
| Smoking Status | ||||
| Missing | 731 (20.1) | 521 (0.5) | 1,030 (0.3) | 144 (0.4) |
| Never | 1,621 (44.7) | 61,443 (52.6) | 178,674 (56.0) | 18,090 (50.8) |
| Former | 810 (22.3) | 39,871 (34.1) | 108,783 (34.1) | 13,020 (36.6) |
| Current | 468 (12.9) | 15,000 (12.8) | 30,736 (9.6) | 4,344 (12.2) |
| Employment/Shift Work | ||||
| Missing | 674 (18.6) | 536 (0.5) | 1,119 (0.4) | 148 (0.4) |
| Employed-Mostly Daytime Work | 576 (15.9) | 55,245 (47.3) | 162,513 (50.9) | 9,645 (27.1) |
| Employed-Job Involves Shift Work | 143 (3.9) | 7,027 (6.0) | 15,310 (4.8) | 1,259 (3.5) |
| Employed-Job Involves Night Shift Work | 223 (6.1) | 8,841 (7.6) | 14,316 (4.5) | 1,264 (3.6) |
| Retired | 1,105 (30.4) | 32,844 (28.1) | 101,946 (31.9) | 17,603 (49.5) |
| Unemployed | 909 (25.0) | 12,342 (10.6) | 24,019 (7.5) | 5,679 (16.0) |
Missingness for analytic variables (Number/475,286): Sleep Duration (3,630/475,286); Chronotype (54,984/475,286); Employment/Shift Work (2,477/475,286); Insomnia/Sleeplessness (1,104/475,286); Snoring (34,608/475,286); Daytime Sleeping (3,235/475,286); Age (0/475,286); Sex (0/475,286); BMI (2,358/475,286); Alcohol Intake (1,378/475,286); Smoking Status, Duration, and Frequency (4,510/475,286); Race (2,321/475,286); Diabetes Status (2,171/475,286).
UK Biobank field codes for variables: Sleep Duration (1160); Chronotype (1180); Employment/Shift Work (6142; 826; 3426); Insomnia/Sleeplessness (1200); Snoring (1210); Daytime Sleeping (1220); Age (21003; 33); Sex (31); BMI (23104; 21001); Alcohol Intake (1558; 1568; 1578; 1588; 1598; 1608; 5364; 20117); Smoking Status, Duration, and Frequency (1239; 1249; 2644; 2877; 2887; 2897; 3446; 3456; 5959; 20116; 21022); Race (21000); Diabetes Status (2443).