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Table 4 Study power depending on number of clusters and average cluster size

From: Evaluation of a tailored intervention to improve management of overweight and obesity in primary care: study protocol of a cluster randomised controlled trial

Average cluster size (M)

> 1,130

163-212

213-309

310-568

569-3,464

> 3,464

> 287

Power (1-β)

0.80

0.80

0.81

0.82

0.83

0.84

0.85

Number of clusters (N)

12

13

14