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Table 1 Characteristics of the population by nighttime sleep, daytime napping and total sleep
| Nighttime sleep | P-value | Daytime napping | P-value | Total sleep | P-value | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| ≤ 6.5 h | > 6.5 h | Non-nappers | ≤ 45 min | > 45 min | ≤ 7.0 h | > 7.0 h | ||||
| No. subjects (%) | 2252 (47.5) | 2488 (52.5) | 2112 (43.4) | 1752 (36.0) | 1004 (20.6) | 2642 (55.7) | 2098 (44.3) | |||
| Age (years) | 74.30 (6.90) | 73.65 (7.18) | 0.002 | 73.41 (7.03) | 74.42 (7.10) | 74.24 (6.98) | < 0.001 | 74.07 (6.88) | 73.81 (7.27) | 0.215 |
| Female (%) | 1306 (60.2) | 1238 (51.4) | < 0.001 | 1169 (57.8) | 924 (55.0) | 516 (52.3) | 0.014 | 1519 (59.7) | 1025 (50.5) | < 0.001 |
| BMI (kg/m2) | 24.15 (4.29) | 26.30 (61.86) | 0.119 | 27.79 (86.89) | 24.26 (4.46) | 24.35 (4.64) | 0.135 | 24.24 (4.75) | 26.61 (67.59) | 0.087 |
| Physical activity (Met·h/week) | 38.99 (131.08) | 37.72 (159.27) | 0.801 | 41.52 (198.05) | 38.90 (110.72) | 29.74 (36.14) | 0.215 | 39.30 (148.82) | 37.12 (143.81) | 0.666 |
| Number of family members | 2.58 (1.35) | 2.55 (1.19) | 0.391 | 2.60 (1.32) | 2.54 (1.22) | 2.57 (1.26) | 0.315 | 2.59 (1.33) | 2.55 (1.18) | 0.277 |
| Family income (yuan, RMB) | 6965.84 (12,668.88) | 7253.11 (9542.72) | 0.424 | 6889.40 (7815.00) | 7011.88 (7484.94) | 7733.63 (19,094.86) | 0.188 | 6891.92 (11,754.57) | 7393.42 (10,298.42) | 0.164 |
| Smoking status (%) | < 0.001 | 0.375 | < 0.001 | |||||||
| Non-smoker | 1808 (85.4) | 1868 (80.1) | 1578 (81.8) | 1405 (84.0) | 750 (82.1) | 2109 (85.0) | 1567 (79.6) | |||
| Ex-smoker | 172 (8.1) | 263 (11.3) | 205 (10.6) | 147 (8.8) | 87 (9.5) | 218 (8.8) | 217 (11.0) | |||
| Current smoker | 135 (6.4) | 201 (8.6) | 146 (7.6) | 120 (7.2) | 76 (8.3) | 152 (6.1) | 184 (9.3) | |||
| Alcohol consumption (%) | 0.525 | 0.444 | 0.388 | |||||||
| None or < once/month | 1960 (89.1) | 2156 (88.2) | 1778 (88.2) | 1508 (88.0) | 887 (90.1) | 2304 (89.2) | 1812 (87.9) | |||
| Past alcohol drinker (>once/month) | 201 (9.1) | 247 (10.1) | 204 (10.1) | 168 (9.8) | 84 (8.5) | 239 (9.2) | 209 (10.1) | |||
| Current alcohol drinker (>once/month) | 39 (1.8) | 41 (1.7) | 33 (1.6) | 36 (2.1) | 14 (1.4) | 41 (1.6) | 39 (1.9) | |||
| Any of chronic diseases (%) | 1685 (85.9) | 1772 (82.0) | 0.001 | 1501 (83.0) | 1279 (82.3) | 740 (88.2) | < 0.001 | 1938 (84.9) | 1519 (82.6) | 0.051 |
| Diabetes (%) | 363 (17.8) | 451 (19.9) | 0.085 | 366 (19.5) | 298 (18.9) | 164 (17.9) | 0.597 | 435 (18.2) | 379 (19.8) | 0.194 |
| CVD (%) | 1277 (56.7) | 1348 (54.2) | 0.086 | 1106 (52.4) | 982 (56.1) | 582 (58.0) | 0.006 | 1447 (54.8) | 1178 (56.1) | 0.358 |
| Dyslipidemia (%) | 634 (28.2) | 638 (25.6) | 0.056 | 542 (25.7) | 484 (27.6) | 273 (27.2) | 0.359 | 724 (27.4) | 548 (26.1) | 0.338 |
| Cancer (%) | 93 (4.7) | 82 (3.8) | 0.145 | 78 (4.3) | 57 (3.7) | 44 (5.0) | 0.329 | 102 (4.4) | 73 (4.0) | 0.518 |
| Arthritis (%) | 389 (17.3) | 307 (12.3) | < 0.001 | 266 (12.6) | 283 (16.2) | 160 (15.9) | 0.003 | 424 (16.0) | 272 (13.0) | 0.003 |
