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| Trial | Statistical approach1 | Intervention | Control |
| Klerman 2001 | Straight into RevMan ‐ not cluster trial | 39/311 | 33/296 |
| Le roux 2013 | Calculated adjusted OR | 88/608 | 123/549 |
ICC from Piaggio paper of 0.0004 for ANC trial with average cluster size 426
