Human sex ratio at birth (multiple and single birth) in Ogoja, Cross River State – M. E Kooffreh and O.G Odey
Human sex ratio at birth seems to vary for many population and ethnic groups due to factors such as cultural practices, sex selection, seasonal variations. Data on sex ratio in Nigerian populations are limited and has not been documented for these parts of Nigeria. This study seeks to analyze the sex ratio at birth of two hospitals in an urban town, Ogoja, Cross River State, Nigeria to add to existing data on sex ratio in Nigeria. Data was retrieved retrospectively from birth records for single and twin births in General Hospital and Maternity Hospital Moniaya all in Ogoja, Cross River State between 2002 and 2011. The data was analyzed to determine sex ratio by year, months and quarter. Chi square analysis was used to determine the deviation of the sex ratios from the expected value. The annual average sex ratio was 95.1:100 and 100.7:100 for general Hospital and Maternity Hospital respectively. General hospital showed the highest 126.8:100 and lowest 82.3:100 monthly sex ratio in April and September respectively. In Maternity hospital, the highest 116.6:100 and lowest 90.6:100 monthly sex ratio was observed in April and February respectively. when pooled together, the average sex ratio was 97.9:100. Data for monthly and quarterly sex ratio did not show any clear seasonal variations. The sex ratio at birth observed in Ogoja, Cross River State indicates a higher number of female to male births.