Table 4.
Relationship between sleep duration at baseline and mortality over follow-up period
| Amount of sleep, h (no.) | Status at follow-up |
X2 (P value) | |
|---|---|---|---|
| Dead | Alive | ||
| Total sample (9789) | |||
| ≤ 5 (912) | 233 (12) | 679 (9) | 278.03 (P < .0001) |
| 6 (1949) | 298 (16) | 1651 (21) | |
| 7 (2852) | 377 (20) | 2475 (31) | |
| 8 (3188) | 647 (34) | 2541 (32) | |
| ≥ 9 (888) | 322 (17) | 566 (7) | |
| Aged 32–59 (5806) | |||
| ≤ 5 (493) | 31 (11) | 462 (8) | 12.64 (P = 0.0132) |
| 6 (1247) | 50 (18) | 1197 (22) | |
| 7 (1921) | 81 (30) | 1840 (33) | |
| 8 (1816) | 85 (31) | 1731 (31) | |
| ≥ 9 (329) | 26 (10) | 303 (5) | |
| Aged 60–86 (3983) | |||
| ≤ 5 (419) | 202 (13) | 217 (9) | 83.57 (P < .0001) |
| 6 (702) | 248 (15) | 454 (19) | |
| 7 (931) | 296 (18) | 635 (27) | |
| 8 (1372) | 562 (35) | 810 (34) | |
| ≥ 9 (559) | 296 (18) | 263 (11) | |
Data are represented as number (%).