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Table 1 Basic demographic characteristics and sleep quality

From: Prevalence and correlates of poor sleep quality among college students: a cross-sectional survey

Variables Total (n = 6284) Cr Good sleep quality (n = 4233) Poor sleep quality (n = 1951) OR 95%CI p
Age
  ≤ 20 4550 72.4% 3106(68.3) 1444(31.7) 1.000   
  > 20 1734 27.6% 1227(70.8) 507(29.2) 1.044 0.871–1.252 0.638
Gender
 Male 3310 52.7% 2284(69.0) 1026(31.0) 1.000   
 Female 2974 47.3% 2049(68.9) 925(31.1) 1.017 0.888–1.166 0.804
Ethnicity
 Han 5737 91.3% 3955(68.9) 1782(31.1) 1.000   
 Minority 547 8.7% 378(69.1) 169(30.9) 0.999 0.815–1.225 0.993
BMI (kg/m2)
  < 18.5 1158 18.5% 813(70.2) 345(29.8) 1.000   0.228
 18.5–23.9 4054 64.5% 2785(68.7) 1269(31.3) 0.769 0.588–1.005 0.055
 24–27.9 774 12.3% 543(70.2) 231(29.8) 0.825 0.645–1.056 0.127
  ≥ 28 298 4.7% 192(64.4) 106(35.6) 0.771 0.581–1.022 0.071
Grade
 Freshman 2586 41.2% 1755(67.9) 831(32.1) 1.000   0.002
 Sophomore 1966 31.3% 1337(68.0) 629(32.0) 0.873 0.760–1.002 0.054
 Junior 1072 17.0% 759(70.8) 313(29.2) 0.677 0.550–0.834 < 0.001
 Senior and senior five 660 10.5% 482(73.0) 178(27.0) 0.663 0.508–0.866 0.003
Monthly family income per capita (¥)
  < 3000 2909 46.3% 1974(67.9) 1974(32.1) 1.000   0.901
 3000–4999 1916 30.5% 1343(70.1) 1343(29.9) 1.029 0.891–1.188 0.695
 5000–6999 842 13.4% 589(70.0) 589(30.0) 1.005 0.830–1.217 0.961
  ≥ 7000 617 9.8% 427(69.2) 427(30.8) 1.085 0.864–1.362 0.481
Monthly living expenses (¥)
  < 1000 2036 32.4% 1367(67.1) 669(32.9) 1.000   0.087
 1000–2000 3646 58.0% 2537(69.6) 1109(30.4) 0.874 0.762–1.004 0.057
 2001–3000 467 7.4% 338(72.4) 129(27.6) 0.829 0.636–1.082 0.168
  > 3000 135 2.1% 91(67.4) 44(32.6) 1.245 0.796–1.947 0.336
  1. Note: Cr, Constituent ratio; ¥1000 = $141