Table 1. Safety belt laws: descriptive information about included studies

Number of studies
Number of studies
Papers meeting inclusion criteria4619-64
Papers excluded, limited execution quality1119,20,30,34,36,37,43,44,46,47,49
Qualifying papers3521-29,31-33,35,38,39-42,45,48,50-64
Papers reporting on an already-included study231,64
Actual number of qualifying studies3321-29,32,33,35,38-42,45,48,50-63
Study designs
Time series with concurrent comparison group725,26,32,40,42,60,63
Time series, no conccurrent comparison group1722,24,27,28,35,38,41,45,50,52,55-59,61,62
Before-after with concurrent comparison group157
Before-after, no concurrent comparison group621,23,29,39,48,51
Cross-sectional233,53
Outcomes reported
Fatal injuries638,42,52,55,56,60
Nonfatal injuries621,23,29,54-56
Fatal and nonfatal injuries combined925,26,28,39-41,45,52,61
Observed safety belt use1022,24,27,35,50-52,58,59,62
Police-reported safety belt use248,63
Self-reported safety belt use432,33,53,57

From: Reviews of Evidence Regarding Interventions to Increase the Use of Safety Belts

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