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Table 3 Prevalence ratio (PR) of factors related to short sleep duration and sleep quality

From: Factors related with quality on sleep of daytime workers

Variables Short Sleep duration (fewer than 6 h) Sleep quality (poor)
PRa 95% CI PR 95% CI
Age (in years)
 < 30 1.00   1.00  
 30–39 0.90 0.72–1.14 0.79 0.53–1.17
 40–49 1.10 0.85–1.43 0.56 0.35–0.91
50 1.18 0.88–1.58 0.47 0.25–0.91
Sex
 Male 1.00   1.00  
 Female 1.07 0.80–1.45 1.30 0.77–2.20
Work type
 Blue-collar 1.00   1.00  
 Office worker 1.12 0.91–1.38 0.86 0.57–1.32
 Researcher 1.27 1.02–1.58 0.90 0.57–1.43
Exercise
 No 1.00   1.00  
 Yes 1.07 0.89–1.29 1.21 0.86–1.71
BMI (kg/m2)b
 < 25 1.00   1.00  
25 1.14 0.96–1.36 1.53 1.10–2.12
Metabolic syndrome
 No 1.00   1.00  
 Yes 1.18 0.93–1.50 1.36 0.87–2.15
Musculoskeletal pain    
 No 1.00   1.00  
 Yes 1.16 0.93–1.45 1.92 1.29–2.84
  1. aPR Prevalence Ratio by using Cox regression analysis
  2. bBMI Body Mass Index