To estimate the expected accrual rate in a double blinded controlled randomized trial of the absolute clinical efficacy of three anti-pertussis vaccines in infants, we performed a series of surveys among mothers and physicians in the areas to be considered for participation in the trial. In this paper, we compared the predicted enrollment with the actual enrollment achieved at the end of the recruitment phase of the trial. The predicted enrollment rate was 27%, while the observed rate was 26%. Results from the feasibility study were highly predictive of actual enrollment rate. In the local health units (USL) where such assessments were carried out, the accrual rate was higher than those not participating in the feasibility phase.
|Number of pages||7|
|Journal||Revue d'Epidemiologie et de Sante Publique|
|Publication status||Published - Oct 1996|
- clinical trials
- KAP study
ASJC Scopus subject areas
- Public Health, Environmental and Occupational Health