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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