Table 2 Baseline characteristics of individuals in 2013
Variables | Total (N = 1,413) | Stable low (N = 1,025) | Decreasing (N = 242) | Increasing (N = 146) | P |
|---|---|---|---|---|---|
Age(years) | 56.95 ± 8.18 | 57.69 ± 8.45 | 54.94 ± 6.88 | 55.06 ± 7.32 | < 0.001 |
Gender |  |  |  |  | < 0.001 |
 Male | 708(50.1) | 477(46.5) | 144(59.5) | 87(59.5) |  |
 Female | 705(49.9) | 548(53.4) | 98(40.4) | 59(40.4) |  |
Residential area |  |  |  |  | < 0.001 |
 Rural | 882(62.4) | 581(56.6) | 190(78.5) | 111(76.0) |  |
 Urban | 531(37.6) | 444(43.3) | 52(21.4) | 35(24.0) |  |
Education levela |  |  |  |  | < 0.001 |
 ≤Primary school | 792(56.2) | 544(53.0) | 157(64.8) | 91(62.3) |  |
 Middle school | 408(28.9) | 300(29.2) | 65(26.8) | 43(29.4) |  |
 ≥high school | 211(14.9) | 179(17.4) | 20(8.2) | 12(8.2) |  |
Marital statusa | Â | Â | Â | Â | 0.183 |
 Married | 1,305(92.4) | 938(91.5) | 229(94.6) | 138(94.5) |  |
 Others | 106(7.5) | 85(8.2) | 13(5.3) | 8(5.5) |  |
Current smokea | Â | Â | Â | Â | 0.009 |
 Yes | 219(15.5) | 142(13.8) | 52(21.4) | 25(17.1) |  |
 No | 917(64.9) | 684(66.7) | 144(59.5) | 89(60.9) |  |
Current alcohol | Â | Â | Â | Â | 0.007 |
 Yes | 543(38.4) | 368(35.9) | 109(45.0) | 66(45.2) |  |
 No | 870(61.6) | 657(64.0) | 133(54.9) | 80(54.7) |  |
Sleep durationa |  |  |  |  | < 0.001 |
 Short sleep | 421(29.8) | 300(29.3) | 75(31.0) | 94(64.4) |  |
 Medium sleep | 899(63.6) | 654(63.8) | 151(62.4) | 46(31.5) |  |
 Long sleep | 79(5.6) | 60(5.6) | 14(5.8) | 5(3.4) |  |