Golding J, Vivian S, Newcombe R G
Early Hum Dev. 1982 Jan;6(1):71-6. doi: 10.1016/0378-3782(82)90059-7.
Methods of studying birth order effect after controlling for final number of pregnancies or the elimination of women with a large number of pregnancies are shown to produce misleading results. The 'cascade' method of analysis is only valid in any population where birth limitation is practised if all pregnancy histories are included and there are no efforts made to control for number of pregnancies. It is suggested that in populations where any form of birth control is practised, so-called longitudinal analyses of perinatal risk should be treated with great caution.
研究控制最终妊娠次数后出生顺序效应的方法，或者排除妊娠次数多的女性的方法，已被证明会产生误导性结果。“级联”分析方法仅在实行生育限制的任何人群中有效，前提是纳入所有妊娠史且不采取控制妊娠次数的措施。建议在实行任何形式节育措施的人群中，对所谓围产期风险的纵向分析应极为谨慎对待。
