Statistical Analysis
REGRESSION
The percentage of eligible patient visits resulting in ABPM and HBPM being completed in the preimplementation and postimplementation periods was calculated for intervention and control clinics, separately. When reporting condition-by-period rates, simple percentages with 95% CIs were used. Multilevel Poisson regression models,We estimated the power to detect a 10% increase in out-of-office BP completion rate due to the intervention (ie, RR 3.0; 15% vs 5%; at a 2-tailed, α = .05 significance level, accounting for within-practice clustering (equivalently, between-practice variability). For a multilevel Poisson regression model with log link function, this variability depends on the coefficient of variation (CV; the SD of practice-level out-of-office BP completion rates divided by their mean).