Results from Cox regression models comparing the hazard of second pregnancy among Child Support Grant recipients relative to non-recipients, in a cohort of 4845 women in Agincourt, South Africa, 1998–2008.

1Adjusted for age (coded with a restricted cubic spline with five knots), education (coded, in years, with a restricted cubic spline with five knots), former refugee status (coded as a dichotomous variable), household wealth (coded with a restricted cubic spline with five knots), and calendar year of birth of first child (coded with a restricted cubic spline with five knots)2Age at birth of first childHR = Hazard Ratio; CI = Confidence Interval; MSM = Marginal Structural ModelResults from Cox regression models comparing the hazard of second pregnancy among Child Support Grant recipients relative to non-recipients, in a cohort of 4845 women in Agincourt, South Africa, 1998–2008.

1. 针对年龄（采用5节点限制性立方样条（restricted cubic spline）编码）、受教育年限（采用5节点限制性立方样条编码）、既往难民身份（编码为二分类变量）、家庭财富（采用5节点限制性立方样条编码）以及首胎出生日历年份（采用5节点限制性立方样条编码）进行校正。
2. 首胎生育年龄
风险比（Hazard Ratio，HR）、置信区间（Confidence Interval，CI）与边际结构模型（Marginal Structural Model，MSM）；
针对南非阿金库尔（Agincourt）1998至2008年间的4845名女性队列，Cox回归模型对比了儿童抚养补助金（Child Support Grant）申领者与非申领者的第二次妊娠发生风险。