"Based on some simple assumptions regarding [the] human reproduction process, a continuous time stochastic model for describing the variation in any closed birth interval of a woman of marital duration (t) has been developed. The model incorporates the possibility of the variation of the amenorrhea period among the women under observation. For illustration, the model is applied to an observed closed birth interval between first and second births of the women with marital duration of seven years."

中文翻译：

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封闭生育间隔的修正随机模型

“基于关于 [the] 人类生殖过程的一些简单假设，已经开发了一个连续时间随机模型，用于描述具有婚姻持续时间 (t) 的女性的任何封闭生育间隔的变化。该模型包含了被观察妇女的闭经期。为了说明，该模型应用于观察到的婚姻持续时间为七年的妇女第一次和第二次生育之间的封闭生育间隔。”