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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

VariablesTotal
n = 2418
Urban
n = 1150
Rurala
n = 1268
P value
Age, mean (SD), years52.5 (12.9)52.4 (13.1)52.6 (12.8)0.739
Gender, n (%)   0.003
 female1523 (62.99)760 (66.09)763 (60.17) 
 male895 (37.01)390 (33.91)505 (39.83) 
Ethnicity, n (%)   < 0.001
 Han1516 (62.70)878 (76.35)638 (50.32) 
 minority902 (37.30)272 (23.65)630 (49.68) 
Marital status, n (%)   0.359
 married2188 (90.49)1034 (89.91)1154 (91.01) 
 unmarried230 (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
  < 10001032 (42.68)303 (26.35)729 (57.49) 
  > 10001386 (57.32)847 (73.65)539 (42.51) 
Smoking, n (%)   0.221
 Yes419 (17.33)186 (16.17)233 (18.38) 
 No1905 (78.78)914 (79.48)991 (78.15) 
Once smoking94 (3.89)50 (4.35)44 (3.47) 
Alcohol use, n (%)   0.015
 Yes401 (16.58)213 (18.52)188 (14.83) 
 No2017 (83.42)937 (81.48)1080 (85.17) 
Drinking tea, n (%)   < 0.001
 Every day965 (39.99)371 (32.37)594 (46.88) 
 5–6 days a week29 (1.20)14 (1.22)15 (1.18) 
 3–4 days a week66 (2.74)31 (2.71)35 (2.76) 
 1–2 days a week50 (2.07)21 (1.83)29 (2.29) 
 Occasion497 (20.60)274 (23.91)223 (17.60) 
 Never806 (33.40)435 (37.96)371 (29.28) 
Physical exercise, n (%)   < 0.001
 Yes2041 (85.58)919 (81.11)1122 (89.62) 
 No374 (14.42)214 (18.89)162 (10.38) 
Hypertension, n (%)   0.077
 Yes532 (22.00)271 (23.57)261 (20.58) 
 No1886 (78.00)879 (76.43)1007 (79.42) 
Diabetes mellitus, n (%)   0.017
 Yes128 (5.29)74 (6.43)54 (4.26) 
 No2290 (94.71)1076 (93.57)1214 (95.74) 
BMI, mean (SD), kg/m225.4 (8.5)25.0 (3.8)25.7 (11.3)0.041
Sleep duration, mean (SD), hour8.1 (1.3)8.0 (1.2)8.1 (1.4)0.002
Sleep onset time, n (%)   < 0.001
 Before 8:00 pm19 (0.78)5 (0.43)14 (1.10) 
 8:00 pm-9:00 pm145 (6.00)35 (3.04)110 (8.68) 
 9:00 pm-10:00 pm503 (20.80)170 (14.78)333 (26.26) 
 10:00 pm-11:00 pm1036 (42.85)466 (40.52)570 (44.95) 
 11:00 pm-12:00midnight685 (28.33)461 (40.09)224 (17.67) 
 After 12:00midnight30 (1.24)13 (1.13)17 (1.34) 
 Triglycerides, M (Q), mmol/L1.2 (0.8,1.9)1.2 (1.2,1.9)1.2 (0.8,1.8)0.192
 Total cholesterol, M (Q), mmol/L3.6 (3.1,4.2)3.6 (3.1,4.1)3.7 (3.2,4.3)< 0.001
 HDL, median (Q), mmol/L1.1 (0.9,1.2)1.1 (0.9,1.3)1.1 (0.9,1.3)0.056
 LDL, median (Q), mmol/L2.5 (2.1,3.0)2.6 (2.6,3.0)2.5 (2.0,3.0)0.006
 FPG, median (Q), mmol/L4.5 (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;