Table 1.
Characteristics of participants with different nighttime duration
| TOTAL n (%) |
Nighttime sleep duration (per night) | |||
|---|---|---|---|---|
| < 6 h n (%) |
6 to less than 8 h n (%) |
≥8 h n (%) |
||
| Successful aging | ||||
| No | 6191 (86.1) | 2156 (87.9) | 2125 (83.0) | 1910 (87.7) |
| Yes | 999 (13.9) | 296 (12.1) | 435 (17.0) | 268 (12.3) |
| Low probability of disease | ||||
| No | 3822 (51.2) | 1363 (53.3) | 1359 (51.5) | 1100 (48.4) |
| Yes | 3647 (48.8) | 1195 (46.7) | 1281 (48.5) | 1171 (51.6) |
| No disease-related disability | ||||
| No | 566 (7.6) | 262 (10.3) | 159 (6.0) | 145 (6.4) |
| Yes | 6884 (92.4) | 2289 (89.7) | 2475 (94.0) | 2120 (93.6) |
| High cognitive functioning | ||||
| No | 3303 (45.2) | 1253 (50.2) | 940 (36.2) | 1110 (50.2) |
| Yes | 4000 (54.8) | 1243 (49.8) | 1657 (63.8) | 1100 (49.8) |
| High physical functioning | ||||
| No | 1480 (20.1) | 652 (25.9) | 413 (15.9) | 415 (18.5) |
| Yes | 5883 (79.9) | 1866 (74.1) | 2190 (84.1) | 1827 (81.5) |
| Active engagement with life | ||||
| No | 3660 (49.0) | 1277 (49.9) | 1198 (45.4) | 1185 (52.2) |
| Yes | 3809 (51.0) | 1281 (50.1) | 1442 (54.6) | 1086 (47.8) |
| Daytime napping (per day) | ||||
| 0 min | 3012 (40.5) | 1220 (47.9) | 968 (36.8) | 824 (36.6) |
| 1–60 min | 2928 (39.4) | 926 (36.4) | 1149 (43.6) | 853 (37.9) |
| > 60 min | 1493 (20.1) | 401 (15.7) | 517 (19.6) | 575 (25.5) |
| Sex | ||||
| Male | 3734 (50.0) | 1080 (42.2) | 1436 (54.4) | 1218 (53.6) |
| Female | 3735 (50.0) | 1478 (57.8) | 1204 (45.6) | 1053 (46.4) |
| Age | ||||
| 60–64 | 2791 (37.4) | 870 (34.0) | 1093 (41.4) | 828 (36.5) |
| 65–74 | 3451 (46.2) | 1212 (47.4) | 1211 (45.9) | 1028 (45.3) |
| ≥ 75 | 1227 (16.4) | 476 (18.6) | 336 (12.7) | 415 (18.3) |
| Community type | ||||
| Rural | 5588 (76.0) | 1940 (77.1) | 1819 (70.3) | 1829 (81.5) |
| Urban | 1761 (24.0) | 577 (22.9) | 770 (29.7) | 414 (18.5) |
| Education | ||||
| No formal education | 2428 (33.3) | 940 (37.5) | 702 (27.4) | 786 (35.5) |
| Did not finish primary school | 1574 (21.6) | 541 (21.6) | 545 (21.2) | 488 (22.1) |
| Sishu/Homeschool/Elementary school | 1745 (24.0) | 553 (22.1) | 658 (25.6) | 534 (24.2) |
| Middle school and above | 1535 (21.1) | 471 (18.8) | 661 (25.8) | 403 (18.2) |
| Marital status | ||||
| Cohabited (married or not) | 5823 (78.0) | 1880 (73.5) | 2159 (81.8) | 1784 (78.6) |
| Did not cohabit (Separated/divorced/widowed and never married) | 1646 (22.0) | 678 (26.5) | 481 (18.2) | 487 (21.4) |
| Annual household income | ||||
| ≤ 2000 CNY | 2474 (33.1) | 917 (35.8) | 777 (29.4) | 780 (34.3) |
| 2001–10,000 CNY | 1796 (24.1) | 657 (25.7) | 591 (22.4) | 548 (24.1) |
| 10,001–25,000 CNY | 1485 (19.9) | 483 (18.9) | 565 (21.4) | 437 (19.2) |
| > 25,000 CNY | 1714 (22.9) | 501 (19.6) | 707 (26.8) | 506 (22.3) |
| Tobacco use | ||||
| No | 3942 (52.8) | 1466 (57.4) | 1325 (50.2) | 1151 (50.7) |
| Yes | 3523 (47.2) | 1090 (42.6) | 1314 (49.8) | 1119 (49.3) |
| Alcohol consumption | ||||
| No | 5001 (67.0) | 1759 (68.8) | 1705 (64.6) | 1537 (67.7) |
| < once a month | 550 (7.4) | 187 (7.3) | 218 (8.3) | 145 (6.4) |
| ≥ once a month | 1915 (25.6) | 611 (23.9) | 716 (27.1) | 588 (25.9) |
| Physical activity | ||||
| No | 4280 (57.3) | 1482 (57.9) | 1487 (56.3) | 1311 (57.7) |
| Yes | 3189 (42.7) | 1076 (42.1) | 1153 (43.7) | 960 (42.3) |
| Low quality of nighttime sleep | ||||
| < 1 day/week | 3805 (51.3) | 716 (28.1) | 1511 (57.6) | 1578 (70.1) |
| 1–2 days/week | 1008 (13.6) | 311 (12.2) | 421 (16.1) | 276 (12.3) |
| 3–4 days/week | 978 (13.2) | 436 (17.1) | 350 (13.3) | 192 (8.5) |
| 5–7 days/week | 1626 (21.9) | 1082 (42.5) | 340 (13.0) | 204 (9.1) |
| Body Mass Index | ||||
| Normal | 3857 (51.6) | 1357 (53.0) | 1333 (50.5) | 1167 (51.4) |
| Underweight | 569 (7.7) | 209 (8.2) | 177 (6.7) | 183 (8.1) |
| Overweight | 2249 (30.1) | 728 (28.5) | 832 (31.5) | 689 (30.3) |
| Obesity | 794 (10.6) | 264 (10.3) | 298 (11.3) | 232 (10.2) |
| Nighttime sleep duration (per night) | ||||
| < 6 h | 2558 (34.3) | – | – | – |
| 6 to less than 8 h | 2640 (35.3) | – | – | – |
| ≥ 8 h | 2271 (30.4) | – | – | – |