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Table 1 Design of the stepped wedge trial for OASI Care Bundle evaluation

From: A multi-centre quality improvement project to reduce the incidence of obstetric anal sphincter injury (OASI): study protocol

Region Time
0 1 2 3 4 5
1   Roll-out 3280 3280 3280 3280
2    Roll-out 3280 3280 3280
3     Roll-out 3280 3280
4      Roll-out 3280