More Is Better
A meta-analysis of home visiting programs (K = 12, N = 2869) examined differences in the effects of home visitor programs for at-risk families on maternal behavior. Studies selected included only peer-reviewed publications and evaluations with a control group design. Although effect sizes varied, programs with more frequent visitation had higher success rates. Dosage, or the frequency of home visits, explained the variance in effect sizes (Q = 22.87, df = 1, p less than 0.05). The year of study publication was not significantly related to effect size, suggesting that the potential effectiveness of home visiting has not diminished over the past two decades. Yet, historical trends indicate a dilution effect, with recent large-scale government programs tending to have lower dosage. (Contains 2 figures.).