Assessment of call efficiency. A, Number of attempts of each call per patient based on whether the attempt was answered or not answered. Inset are the results of univariate analysis of whether there were differences in the proportion of each call number answered versus not answered. B, Predicted probability of a call being answered based on a logistic regression model: Pr(answered call) = e(β0 + β1 × No. of calls)/1 + e(β0 + β1 × No. of calls). The probability of a call being answered is displayed (range 0.0-1.0; red line) along with the 95% CI bands (shaded pink region).