Birth outcomes among booked and unbooked women at a secondary health facility in southwest Nigeria: implications for strengthening perinatal health services.

A case-controlled analytic study involving 406 singleton unbooked and 396 singleton booked births was conducted. Unbooked births constituted 16.6% of all births during the study. Booked births were half as likely to preterm than unbooked births (43, 10.9% vs 81, 20.0%; p<0.001). Unbooked births were seven times more likely to be stillbirth than booked births (80, 17.7% vs 13, 3.3%; p< 0.001). Booked births were a third as likely to have a low birth weight as unbooked births (36, 9.1% vs 104, 25.6%; p< 0.001). Unbooked births had a significantly lower mean birth weight of 2.95 ± 0.53 kg than 3.08 ± 0.45 kg of booked births (p< 0.001). Unbooked births had a significantly lower mean Apgar score at 1 minute and 5 minutes than booked births (6.64 ± 1.42 vs 7.08 ± 1.12 and 9.16 ± 1.40 vs 9.64 ± 1.00; p< 0.001) respectively. Unbooked births are common and their birth outcomes may result in high morbidity and disability, thereby contributing to the high child mortality in developing countries. Strengthening perinatal health services through professional skilled care at birth and providing quality services for all unbooked births may lead to improved birth outcomes.