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Table 2 Sample size calculation

From: Community-based intervention for blood pressure reduction in Nepal (COBIN trial): study protocol for a cluster-randomized controlled trial

Category

Mean difference (mmHg)

SD

Intracluster correlation coefficient

Design effect

Clusters per arm

Individuals per arm

Total sample size

Normotensive

5

18.8

0.01

1.57

7

406

812

Prehypertensive

5

13.6

0.01

1.23

7

168

336

Hypertensive

5

15.7

0.01

1.34

7

245

490