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Prevalence of elective induction for subgroups of deliveries, 2001–2007. (A) By health plan. Each line represents one health plan, labeled with a letter (A–F). (B) By gestational age. Lines represent the following gestational ages: 40 completed weeks (diamonds); 39 completed weeks (squares); and 35–38 completed weeks (circles). (C) By parity. Lines represent parous (circles) and nulliparous (squares) women.
