2.
Comparison of baseline characteristics between those with missing and people with complete data on sleep duration
| Variables | Availability of data on sleep duration | P value | |
| No (n=7, 133) | Yes (n=21, 026) | ||
| Age (mean±SD) | 70.4±9.3 | 68.3±8.8 | ﹤0.000, 1 |
| Body mass index (mean±SD) | 25.3±3.8 | 25.9±3.5 | ﹤0.000, 1 |
| Race (% White) | 3, 945 (89.7) | 19, 098 (91.3) | 0.001 |
| Smoking (%) | ﹤0.000, 1 | ||
| Never | 2, 053 (46.6) | 11, 638 (55.4) | |
| Past | 2, 150 (48.7) | 8, 777 (41.8) | |
| Current | 207 (4.7) | 578 (2.8) | |
| Exercise frequency (%) | ﹤0.000, 1 | ||
| Rarely/never | 1, 880 (44.2) | 7, 272 (34.9) | |
| 1-3/mo | 102 (2.4) | 504 (2.4) | |
| 1-4/wk | 1, 568 (36.9) | 9, 282 (44.6) | |
| 5-7/wk | 702 (16.5) | 3, 767 (18.1) | |
| Alcohol consumption (drinks/wk) (%) | ﹤0.000, 1 | ||
| ﹤1/wk | 1, 450 (34.4) | 6, 235 (29.8) | |
| 1-4/wk | 1, 101 (26.1) | 5, 784 (27.6) | |
| 5-7/wk | 935 (22.1) | 4, 968 (23.7) | |
| > 7/wk | 732 (17.4) | 3, 947 (18.9) | |
| History of snoring (%) | ﹤0.000, 1 | ||
| Rarely/never | 84 (1.2) | 4, 110 (19.5) | |
| Few/occasionally | 173 (2.4) | 8, 319 (39.6) | |
| Mostly/always | 143 (2.0) | 6, 799 (32.3) | |
| Unknown/missing | 6, 733 (94.4) | 1, 798 (8.6) | |
| Sleep apnea (%) | 85 (5.8) | 895 (4.3 | 0.007 |
| Prevalent diabetes (%) | 784(11.0) | 1, 821 (8.7) | ﹤0.000, 1 |
| Parental history of cancer (%) | 1, 019 (51.36) | 10, 086 (53.84) | 0.036 |
| Calories (median, IQR) | 1, 588 (1, 261-1, 908) | 1, 616 (1, 312-1, 987) | ﹤0.000, 1 |