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Table 2 Study Outcomes

From: Impact of passenger engagement through road safety bus stickers in public service vehicles on road traffic crashes in Zambia: a randomized controlled trial

No. Study Comparison Variable Indicator Source
1. Primary Outcome Indicator
1 Difference between intervention and control buses Change in traffic crash rate per 1000 buses over a 14-month period Whether the bus experienced a road traffic crash as reported from motor vehicle insurance claims among those buses during 7-month period of study or 7-months prior to study Data on motor vehicle insurance claims
2. Secondary Outcome Indicators
2 Difference between intervention and control buses Change in the traffic crash rate per 1000 buses overtime for a 14-month period (monthly analysis) Whether the bus experienced a road traffic crash as reported from motor vehicle insurance claims for each month for the 7-month period of study or 7-months prior to study (repeated measures or monthly analysis) Data on motor vehicle insurance claims
3 Difference between intervention and control buses Change in crashes resulting in fatalities per 1000 buses over a 14-month period Total number of fatalities from road traffic crashes during the period of the study as compared to the 7 months prior to the study Data on motor vehicle insurance claims
4 Pre vs. Post (overall and not separated per arm) Mean number of road traffic crashes Total number of road traffic crashes during the period of the study as compared to the 7 months prior to the study RTSA data and Zambia road traffic police reports;
  1. Lists one primary outcome of interest and three secondary outcomes of interest. The primary source of information will be data from motor vehicle insurance claims while road traffic police reports will be used for only one secondary outcome