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Table 1 Power calculation

From: Evaluating a multicomponent program to improve hypertension control in Guatemala: study protocol for an effectiveness-implementation cluster randomized trial

Follow-up rateSample size for analysis (total/per health district)Intra-class correlation
0.0500.0550.0600.0650.0700.075
80%1260/350.91320.89610.87910.86140.84340.8524
81%1296/360.91540.89870.88210.86310.84530.8275
83%1332/370.91760.90130.88360.86650.84900.8295
85%1368/380.91970.90380.88650.86810.85080.8336
  1. a = 0.05, control rate in control group = 50%, difference in control rate between intervention and control groups = 15%, total sample size = 1584 participants