Rehan N E
Br J Obstet Gynaecol. 1982 Feb;89(2):136-41. doi: 10.1111/j.1471-0528.1982.tb04680.x.
With data from the birth registry of the Katsina Local Government Authority, the sex ratio was calculated for 1113313 Hausa children born alive between 1961 and 1980. The sex ratio was 1.07, which is significantly higher than the usually accepted value (less than 1.04) for populations of African origin. There was no seasonal variation or apparent relation to coital frequency or gonadotrophin levels. The sex ratio in another set of data comprising 5780 hospital births was 1.17 for normal and 1.31 for complicated deliveries. The sex ratio did not appear to be influenced by maternal age or parity. This set of data point to some selective bias in hospital statistics.
利用卡齐纳地方政府当局出生登记处的数据，计算了1961年至1980年间出生的1113313名豪萨族存活儿童的性别比。性别比为1.07，显著高于非洲裔人群通常接受的值（小于1.04）。没有季节性变化，也没有与性交频率或促性腺激素水平的明显关系。另一组包含5780例医院分娩的数据中，正常分娩的性别比为1.17，复杂分娩的性别比为1.31。性别比似乎不受母亲年龄或胎次的影响。这组数据表明医院统计中存在一些选择性偏差。
