Skip to main content

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