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Table 3 Crude and adjusted prevalence ratios (95% CI) of severe sleepiness (KSS ≥ 7) while driving for Alternating day shift bus drivers relative to Daily two shift bus drivers for five different time periods

From: Sleepiness while driving and shiftwork patterns among Korean bus drivers

Driving time Crude PR (95% CI)a Adjusted PR (95% CI)b Adjusted PR (95% CI)c
First 1.18 (0.51–2.70) 1.21 (0.52–2.82) 1.22 (0.52–2.89)
Morning 0.80 (0.37–1.70) 0.77 (0.35–1.67) 0.70 (0.31–1.57)
Post-lunch *3.91 (2.27–6.72) *4.12 (2.39–7.11) *3.97 (2.29–6.90)
Afternoon *19.76 (4.92–79.37) *19.66 (4.88–79.20) *18.26 (4.51–73.89)
Last *6.69 (2.99–15.00) *6.36 (2.83–14.32) *5.71 (2.51–12.99)
  1. * p < 0.05, aUnadjusted for other variables, bAdjusted for job duration, cAdjusted for job duration, alcohol consumption and sleeping time on workdays, PR Prevalence Ratio, CI Confidence Interval