Variables | Groups | < 6 h (n = 243) | 6–8 h (n = 356) | ≥ 8 h (n = 89) | P |
---|---|---|---|---|---|
Age (years) | ≤ 70(%) | 86(35.4) | 150(42.1) | 49(55.1) | 0.002 |
> 70(%) | 157(64.6) | 206(57.9) | 40(44.9) |  | |
Gender | Male(%) | 74(30.5) | 140(39.3) | 45(50.6) | 0.001 |
Female(%) | 169(69.5) | 216(60.7) | 44(49.4) | Â | |
Residence | Community(%) | 143(58.8) | 249(69.9) | 71(79.8) | < 0.001 |
Nursing home(%) | 100(41.2) | 107(30.1) | 18(20.2) | Â | |
Education level | Primary school or lower(%) | 67(27.6) | 76(21.3) | 14(15.7) | 0.088 |
Junior high school(%) | 63(25.9) | 101(28.4) | 22(24.7) | Â | |
Senior high school(%) | 77(31.7) | 114(32.0) | 38(42.7) | Â | |
College or higher(%) | 36(14.8) | 65(18.3) | 15(16.9) | Â | |
Cohabitation status | Married/Cohabitant(%) | 133(54.7) | 242(68.0) | 72(80.9) | 0.001 |
Monthly income (yuan) | < 3500(%) | 42(17.3) | 75(21.1) | 26(29.2) | 0.057 |
3500 to 5999(%) | 151(62.1) | 210(59.0) | 53(59.6) | Â | |
> 6000(%) | 50(20.6) | 71(19.9) | 10(11.2) |  | |
Current smoking | Yes(%) | 15(6.2) | 38(10.7) | 12(13.5) | 0.021 |
Alcohol consumption | Yes(%) | 13(5.3) | 25(7.0) | 9(10.1) | 0.146 |
Tea-drinking habits | Yes(%) | 73(30.0) | 154(43.3) | 44(49.4) | < 0.001 |
Exercise frequency | Hardly(%) | 42(17.3) | 67(18.8) | 13(14.6) | 0.199 |
Occasionally(%) | 19(7.8) | 42(11.8) | 12(13.5) | Â | |
Frequently(%) | 182(74.9) | 247(69.4) | 64(71.9) | Â | |
BMI (kg/m2) | <  18.5(%) | 22(9.1) | 26(7.3) | 7(7.9) | 0.822 |
18.5 to 24(%) | 123(50.6) | 188(52.8) | 45(50.6) | Â | |
≥ 24(%) | 98(40.3) | 142(39.9) | 37(41.6) |  | |
Napping habit | Yes(%) | 189(77.8) | 277(77.8) | 71(79.8) | 0.781 |
Hypertension | Yes(%) | 155(63.8) | 190(53.4) | 49(55.1) | 0.026 |
Diabetes | Yes(%) | 51(21.0) | 78(21.9) | 24(27.0) | 0.346 |
Depression symptoms | Yes(%) | 64(26.3) | 29(8.1) | 2(2.2) | < 0.001 |
Anxiety symptoms | Yes(%) | 18(7.4) | 15(4.2) | 2(2.2) | 0.030 |