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A, Incidence of IVH, all grades. Number of patients who received indomethacin prophylaxis <6 hours after birth: 120 males and 89 females; number who received indomethacin prophylaxis >6 hours after birth: 20 males and 20 females. B, Incidence of severe IVH. Number of patients who received indomethacin prophylaxis <6 hours after birth: 57 males and 31 females; number who received indomethacin prophylaxis >6 hours after birth: 8 males and 12 females. *P < .05. Values are percent of IVH.
