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Table 2 Power/Sample size calculations

From: Protocol for a cluster randomized controlled trial to study the effectiveness of an obesity and diabetes intervention (PASOS) in an immigrant farmworker population

Mean difference

(SD = 5%)

ICC

IF

Total N needed for individual randomization

Total N needed for CRT

Total # of clusters = N/100a

4%

0.01

2.99

52

156

2

0.02

4.98

52

259

4

0.05

10.95

52

570

6

3%

0.01

2.99

90

270

4

0.02

4.98

90

449

6

0.05

10.95

90

986

10

  1. aRounded up to even number integer