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Table 1 The demographic characteristics of the participants

From: The relationship between sleep onset time and cardiometabolic biomarkers in Chinese communities: a cross-sectional study

Variables

Total

n = 2418

Urban

n = 1150

Rurala

n = 1268

P value

Age, mean (SD), years

52.5 (12.9)

52.4 (13.1)

52.6 (12.8)

0.739

Gender, n (%)

   

0.003

 female

1523 (62.99)

760 (66.09)

763 (60.17)

 

 male

895 (37.01)

390 (33.91)

505 (39.83)

 

Ethnicity, n (%)

   

< 0.001

 Han

1516 (62.70)

878 (76.35)

638 (50.32)

 

 minority

902 (37.30)

272 (23.65)

630 (49.68)

 

Marital status, n (%)

   

0.359

 married

2188 (90.49)

1034 (89.91)

1154 (91.01)

 

 unmarried

230 (9.51)

116 (10.09)

114 (8.99)

 

Occupation, farmer, n (%)

1177 (48.70)

231 (19.60)

946 (80.37)

< 0.001

Education, years, mean (SD)

5.8 (4.70)

7.6 (4.90)

4.2 (3.90)

< 0.001

FCMI, n (%)

   

< 0.001

  < 1000

1032 (42.68)

303 (26.35)

729 (57.49)

 

  > 1000

1386 (57.32)

847 (73.65)

539 (42.51)

 

Smoking, n (%)

   

0.221

 Yes

419 (17.33)

186 (16.17)

233 (18.38)

 

 No

1905 (78.78)

914 (79.48)

991 (78.15)

 

Once smoking

94 (3.89)

50 (4.35)

44 (3.47)

 

Alcohol use, n (%)

   

0.015

 Yes

401 (16.58)

213 (18.52)

188 (14.83)

 

 No

2017 (83.42)

937 (81.48)

1080 (85.17)

 

Drinking tea, n (%)

   

< 0.001

 Every day

965 (39.99)

371 (32.37)

594 (46.88)

 

 5–6 days a week

29 (1.20)

14 (1.22)

15 (1.18)

 

 3–4 days a week

66 (2.74)

31 (2.71)

35 (2.76)

 

 1–2 days a week

50 (2.07)

21 (1.83)

29 (2.29)

 

 Occasion

497 (20.60)

274 (23.91)

223 (17.60)

 

 Never

806 (33.40)

435 (37.96)

371 (29.28)

 

Physical exercise, n (%)

   

< 0.001

 Yes

2041 (85.58)

919 (81.11)

1122 (89.62)

 

 No

374 (14.42)

214 (18.89)

162 (10.38)

 

Hypertension, n (%)

   

0.077

 Yes

532 (22.00)

271 (23.57)

261 (20.58)

 

 No

1886 (78.00)

879 (76.43)

1007 (79.42)

 

Diabetes mellitus, n (%)

   

0.017

 Yes

128 (5.29)

74 (6.43)

54 (4.26)

 

 No

2290 (94.71)

1076 (93.57)

1214 (95.74)

 

BMI, mean (SD), kg/m2

25.4 (8.5)

25.0 (3.8)

25.7 (11.3)

0.041

Sleep duration, mean (SD), hour

8.1 (1.3)

8.0 (1.2)

8.1 (1.4)

0.002

Sleep onset time, n (%)

   

< 0.001

 Before 8:00 pm

19 (0.78)

5 (0.43)

14 (1.10)

 

 8:00 pm-9:00 pm

145 (6.00)

35 (3.04)

110 (8.68)

 

 9:00 pm-10:00 pm

503 (20.80)

170 (14.78)

333 (26.26)

 

 10:00 pm-11:00 pm

1036 (42.85)

466 (40.52)

570 (44.95)

 

 11:00 pm-12:00midnight

685 (28.33)

461 (40.09)

224 (17.67)

 

 After 12:00midnight

30 (1.24)

13 (1.13)

17 (1.34)

 

 Triglycerides, M (Q), mmol/L

1.2 (0.8,1.9)

1.2 (1.2,1.9)

1.2 (0.8,1.8)

0.192

 Total cholesterol, M (Q), mmol/L

3.6 (3.1,4.2)

3.6 (3.1,4.1)

3.7 (3.2,4.3)

< 0.001

 HDL, median (Q), mmol/L

1.1 (0.9,1.2)

1.1 (0.9,1.3)

1.1 (0.9,1.3)

0.056

 LDL, median (Q), mmol/L

2.5 (2.1,3.0)

2.6 (2.6,3.0)

2.5 (2.0,3.0)

0.006

 FPG, median (Q), mmol/L

4.5 (4.1,5.0)

4.6 (4.3,5.1)

4.4 (4.1,4.9)

< 0.001

  1. a: compared with urban; SD Standard deviation, Q Quartile, FCMI Family per capita monthly income, HDL High-density lipoprotein cholesterol, LDL low-density lipoprotein cholesterol, FPG fasting plasma glucose;