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Table 2 Rating scale for the quality of delivery of the classes and information sessions

From: Process evaluation for OptiBIRTH, a randomised controlled trial of a complex intervention designed to increase rates of vaginal birth after caesarean section

High quality Both antenatal classes delivered with an average quality mark of at least 80%
Moderate quality Both antenatal classes delivered with an average quality mark of 65–79%
Low quality Both antenatal classes delivered with an average quality mark of 50–64%