Table 1. The original data and adjusted data of continuous data of the cluster-randomised trial (Luoto 2011).
| Outcome | Intervention (Original data) | Control (Original data) | M1 | ICC2 | Design effect3 | Adjusted sample4 sizes | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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| Cluster number | Total number | x ± SD | Cluster number | Total number | x ± SD | Intervention | Control | ||||
| Maternal | 7 | 216 | 13.8±5.8 | 7 | 179 | 14.2±5.1 | 28.21 | 0.12 | 4.27 | 50.64 | 41.96 |
| Weight gain | |||||||||||
1
M = average cluster size = ((total number of intervention + total number of control)/(cluster number of intervention + cluster number of control)
2
ICC = intraclass correlation; obtained from the reliable external source (Luoto 2010).
3
Design effect = 1 + (M-1)/ICC
4
Adjusted sample sizes = n / design effect