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Table 4 Prevalence ratio of factors related to the 7 sub-categories of the PSQIa

From: Factors related with quality on sleep of daytime workers

Variables PRb (95% CI)
Subjective sleep quality Sleep latency Sleep duration Habitual sleep efficiency Sleep disturbances Sleep medication Daytime dysfunction
Age (in years)
 < 30 1.00 1.00 1.00 1.00 1.00 1.00 1.00
 30–39 0.87 (0.62–1.22) 0.94 (0.65–1.35) 0.90 (0.72–1.14) 0.83 (0.35–1.93) 0.00 (0.00–0.00) 0.20 (0.02–2.24) 0.59 (0.40–0.86)
 40–49 0.51 (0.33–0.81) 0.75 (0.48–1.18) 1.10 (0.85–1.43) 0.69 (0.24–2.02) 0.00 (0.00–0.00) 1.71 (0.30–9.77) 0.28 (0.16–0.51)
50 0.34 (0.17–0.65) 0.92 (0.55–1.53) 1.18 (0.88–1.58) 0.21 (0.03–1.71) 0.00 (0.00–0.00) 0.75 (0.06–8.71) 0.09 (0.03–0.30)
Sex
 Male 1.00 1.00 1.00 1.00 1.00 1.00 1.00
 Female 1.97 (1.37–2.85) 1.57 (1.03–2.40) 1.07 (0.80–1.45) 2.68 (1.13–6.33) 0.00 (0.00–0.00) 1.96 (0.22–17.3) 1.41 (0.87–2.28)
BMI (kg/m2)c
 < 25 1.00 1.00 1.00 1.00 1.00 1.00 1.00
25 1.09 (0.82–1.47) 1.07 (0.80–1.43) 1.14 (0.96–1.36) 1.48 (0.72–3.06) 1.52 (0.49–4.74) 1.16 (0.27–4.94) 0.88 (0.61–1.27)
Musculoskeletal pain
 No 1.00 1.00 1.00 1.00 1.00 1.00 1.00
 Yes 2.16 (1.57–2.98) 1.54 (1.09–2.17) 1.15 (0.93–1.45) 0.79 (0.29–2.13) 9.28 (2.92–29.5) 4.51 (0.95–21.3) 2.09 (1.41–3.10)
  1. aPSQI Pittsburgh Sleep Quality Index
  2. bPR Prevalence Ratio by using Cox regression analysis
  3. cBMI Body Mass Index