In Reply.— Vickery and Fries correctly observe that because of large variations in physician visits among any group of persons or families, it is difficult to show a statistically significant impact on physician visits with any intervention. The correct conclusion from our study is that the book alone, or the book plus the financial incentive, does not increase or decrease use of physicians by 21% or more in a prepaid health plan.We calculate that future studies will need nearly 2,500 families to reliably detect a true 7.5% reduction because of the book's effect if populations with similar variability in use are studied.We agree that firm conclusions about increases or decreases of less magnitude than 21% should not be made from this study because of large variances relative to the 700 families in the study. This includes the 7.5% greater decrease among the experimental groups in this study. Since
Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature
Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal
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