Design
This study used an experimental design, randomly assigning
subjects in a pretest-posttest control group design
(Campbell & Stanley, 1963) to contrast the effects of three
interventions on factory workers’ use of HPDs. The interventions
were:
1. a tailored intervention, in which workers received
information based on the predictors of HPD use
from the causal model obtained in the original study
of a large group of factory workers (Lusk et al.,
1995), but tailored to each individual’s specific
responses to the survey items
2. a nontailored predictor-based intervention
3. a control intervention