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Table 4 Sample size estimations for the VIBRA trial

From: VIBRA trial – Effect of village-based refill of ART following home-based same-day ART initiation vs clinic-based ART refill on viral suppression among individuals living with HIV: protocol of a cluster-randomized clinical trial in rural Lesotho

Control rate of viral suppression

Intervention rate of viral suppression

Power

Intra-cluster correlation coefficient

Average number of eligible individuals per cluster

Total number of clusters

Total sample size

0.5

0.7

0.9

0.015

4

120

478

0.5

0.7

0.9

0.015

3

160

478

0.5

0.7

0.9

0.015

2

240

478

0.5

0.7

0.8

0.015

4

66

262

0.5

0.7

0.8

0.015

3

88

262

0.5

0.7

0.8

0.015

2

130

262

0.5

0.75

0.9

0.015

4

49

195

0.5

0.75

0.9

0.015

3

65

195

0.5

0.75

0.9

0.015

2

98

195

0.5

0.75

0.8

0.015

4

33

130

0.5

0.75

0.8

0.015

3

44

130

0.5

0.75

0.8

0.015

2

65

130