CI1.79, 0.81) for initial effect and progressive
effect, respectively.
Effectiveness of a Drug-Free-Workplace Program
on Nonfatal Injuries
Re-analysis of results of the original study. One study29
showed a significant initial intervention effect of a
drug-free-workplace program with a nonfatal-injury
rate difference of 7.59 per 100 person-years between
the intervention and control group (Table 3). The
study had a downward trend of injuries over time
pre-intervention. A progressive effect of the intervention
was observed, with an injury rate difference of
1.97 per 100 person-years per year between the
intervention and control group. This yielded effect
sizes of 6.78 (95% CI10.01, 3.55) and 1.76
(95% CI3.11, 0.41) for initial effect and progressive
effect, respectively.
CI1.79, 0.81) for initial effect and progressiveeffect, respectively.Effectiveness of a Drug-Free-Workplace Programon Nonfatal InjuriesRe-analysis of results of the original study. One study29showed a significant initial intervention effect of adrug-free-workplace program with a nonfatal-injuryrate difference of 7.59 per 100 person-years betweenthe intervention and control group (Table 3). Thestudy had a downward trend of injuries over timepre-intervention. A progressive effect of the interventionwas observed, with an injury rate difference of1.97 per 100 person-years per year between theintervention and control group. This yielded effectsizes of 6.78 (95% CI10.01, 3.55) and 1.76(95% CI3.11, 0.41) for initial effect and progressiveeffect, respectively.
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