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Table 1 Characteristics of study population

From: Comparison of self-reported scales and structured interviews for the assessment of depression in an urban male working population in Japan: a cross-sectional survey

Variable Total eligible sample Participants Non-participants P-value
n 396 324 72  
Age, years 44.2 ± 8.42 43.8 ± 8.37 45.7 ± 8.56 0.089
BMI, kg/m2 23.6 ± 3.03 23.7 ± 3.07 23.2 ± 2.85 0.208
ESS 8.0 ± 4.3 8.1 ± 4.3 7.6 ± 4.4 0.305
PSQI 4.7 ± 2.0 4.8 ± 2.0 4.2 ± 1.9 0.011
TST, hour 5.9 ± 0.86 5.9 ± 0.85 6.0 ± 0.89 0.748
SF-36 PF 53.8 ± 6.28 53.8 ± 6.41 54.0 ± 5.69 0.746
             RP 52.1 ± 7.80 52.3 ± 7.30 51.2 ± 9.71 0.332
             BP 51.4 ± 9.63 51.4 ± 7.27 51.5 ± 11.2 0.893
             GH 51.2 ± 8.88 51.0 ± 9.05 52.1 ± 8.07 0.341
             VT 50.5 ± 8.54 50.2 ± 8.24 52.0 ± 9.71 0.110
             SF 52.7 ± 8.00 52.8 ± 7.78 52.3 ± 8.97 0.620
             RE 51.7 ± 7.90 51.5 ± 7.76 52.1 ± 8.54 0.567
             MH 50.6 ± 8.90 50.6 ± 8.76 51.0 ± 9.57 0.715
  1. Independent t-tests were performed to compare continuous data between participants and non-participants. The total sleep time (TST) was obtained from the questionnaire
  2. PSQI Pittsburgh Sleep Quality Index, ESS Epworth sleepiness scale; Medical Outcomes Study 36-item Health Survey (SF-36), PF physical functioning, RP role limitations due to physical health (role-physical); BP, bodily pain, GH general health perceptions, VT vitality, SF social functioning, RE role limitations due to emotional problems (role-emotional); and MH mental health