Among fetuses delivered to all the emergency obstetric referrals, 18 fresh stillbirths without external malformation and 2 deaths in neonatal period were assigned to be due to birth asphyxia. Therefore, rate of IPPM was 80/1000 births. On univariate analysis, socio-economic risk factors of IPPM included father engaged in unskilled labor (95% versus 59%,P=0.01) and absence of television in household (15% vs. 41.2%, P=0.03) (Web Table I). Health-care seeking or health-care delivery associated risk factors included traditional birth attendant being antenatal care provider (10.5% vs 0.4%,P=0.003) and not having hemoglobin estimation (35% vs 7.9%, P<0.001) or urine examination (35% vs 8.4%, P<0.001) during antenatal care (Web Table II). Clinical risk factor of IPPM was presence of obstructed labor (10% vs 0.4%, P=0.02). (Web Table III). There was no difference in durations between onset of labor and reaching first birth attendant (minutes, median [IQR]: 60 [30-540] vs 150 [0-600], P=0.47), between time of referral and time of reaching referral centre (minutes, median [IQR]: 158.5 [109.5-232.5] vs 150 [90-255], P=0.76) or between time of reaching referral centre and time of delivery (minutes, median [IQR]: 260.5 [65-426] vs 202 [68-468], P=0.72).
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