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Table 1 Characteristics of participants by sleep duration per daya

From: U-shaped association between sleep duration and subjective cognitive complaints in Chinese elderly: a cross-sectional study

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)  
Residence Community(%) 143(58.8) 249(69.9) 71(79.8) < 0.001
Nursing home(%) 100(41.2) 107(30.1) 18(20.2)  
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)  
Senior high school(%) 77(31.7) 114(32.0) 38(42.7)  
College or higher(%) 36(14.8) 65(18.3) 15(16.9)  
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)  
> 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)  
Frequently(%) 182(74.9) 247(69.4) 64(71.9)  
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)  
≥ 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
  1. BMI Body mass index
  2. aData were statistically analyzed using the Mann-Whitney U test and Kruskal-Wallis test