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

Table 1 Power calculation

Follow-up rate	Sample size for analysis (total/per health district)	Intra-class correlation
Follow-up rate	Sample size for analysis (total/per health district)	0.050	0.055	0.060	0.065	0.070	0.075
80%	1260/35	0.9132	0.8961	0.8791	0.8614	0.8434	0.8524
81%	1296/36	0.9154	0.8987	0.8821	0.8631	0.8453	0.8275
83%	1332/37	0.9176	0.9013	0.8836	0.8665	0.8490	0.8295
85%	1368/38	0.9197	0.9038	0.8865	0.8681	0.8508	0.8336

a = 0.05, control rate in control group = 50%, difference in control rate between intervention and control groups = 15%, total sample size = 1584 participants

ISSN: 1745-6215