A taxi company wants to implement a policy to diminish the risk of falling asleep behind the wheel. The company has the greatest number of accidents due to drivers falling asleep on the evening shift between 9 p.m. and 11 p.m. The company is considering either opening the company gym for use by the cab drivers between 1 p.m. and 3 p.m. or making free coffee available during the dinner hour (6 p.m.–7 p.m.). Which policy would the research about the risk of falling asleep support implementing?

The small cohort study with medical residents was replicated, but this time the researchers examined the effect of these exposures on sleep 6 hours later. See Table 13-9.

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Variable Caffeine Melatonin Exercise Television RR 0.89 1.02 1.34 0.96 95% CI 0.541.51 0.801.45 1.172.08 0.890.99