Participation Rates in 11 National Dental Practice-Based Research Network Surveys 2014-2022

Surveys of health professionals typically have low response rates, which have decreased in recent years. We report on the methods used, participation rates, and study time for 11 national questionnaire studies of dentists conducted from 2014-2022. Participation rates decreased (87%-25%). Concurrent with this decrease was a decrease in the intensity with which the practitioners were recruited. Participation rates were higher when postal mail invitation and paper options were used (84% vs. 58%, p < .001). Completion rates were nearly twice as high in studies that recruited in waves than those that did not (61% vs. 35%, p = .003). Study time varied from 2.6 to 28.4 weeks. Study time was longest when postal mail and completion on paper were used (26.0 vs. 11.3 weeks, p = .01). Among studies using only online methods, study time was longer when invitations were staggered than when all invitations went out in one bolus (means 12.0 and 5.2, p = .04). Study time was positively correlated with participation rates (Spearman r = .80, p = .005). General dentists participated at an average of 12% higher rates than specialists. Recruitment methodology, such as recruiting in waves or stages, should be considered when designing surveys.