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Table 1 Basic characteristics of participants in females and males (N = 512,891)

From: The relationship between depression, daytime napping, daytime dysfunction, and snoring in 0.5 million Chinese populations: exploring the effects of socio-economic status and age

  Female (N = 302,632) Male (N = 210,259)
Basic characteristics
 Age, years * 50.96 (10.48) 52.35 (10.90)
 Urban, % 44.55 43.45
 Married, % 88.98 92.90
Education, %
 Uneducated & Primary school 56.72 42.23
 High schools 38.83 49.90
 University 4.45 7.87
Income (Yuan), %
  < 9999 29.77 26.04
 10,000–34,999 53.78 53.73
  > 35,000 16.45 20.23
Occupation, %
 Agriculture worker 40.55 43.41
 Non-agriculture worker 59.45 56.59
Lifestyle factors
 SBP, mmHg * 129.87 (21.99) 132.82 (20.04)
 MET, MET-hour/day * 20.42 (12.76) 20.03 (15.29)
 Depression, % 0.78 0.46
Smoking, %
 Never 94.93 14.42
 Occasional 2.70 24.52
 Regular 2.37 61.07
Alcohol, %
 Never 63.58 20.36
 Occasional 32.96 40.14
 Regular 3.46 39.51
Sleep Status
 Having daytime sleep, % 18.35 24.52
 Sleep hours, hours * 7.35 (1.40) 7.42 (1.33)
  1. *Continuous variables are presented in Mean (SD)