Table 4

Examples of study designs commonly used in the evaluation of injury interventions: experimental designs

Adapted from Shortell and Richardson, 1978.23
(1) Post-test only control group design
Randomize then:
    Group 1Intervene→observe
    Group 2No action→observe
        Examples: assessed softball player sliding injuries as teams randomly rotated to play on ballfields with and without breakaway bases in Michigan39; assessed seat belt use after television messages were broadcast to population on one of two television cable systems in a test community1; assessed fall rates after elderly group randomized into fall prevention program in Connecticut52