Ramos-Cordero R A, Ackman C F, Naftolin F
Fertil Steril. 1979 Apr;31(4):410-2. doi: 10.1016/s0015-0282(16)43938-5.
Two groups of vasectomy patients were reviewed: 376 men operated upon between 1968 and 1971 and 608 between 1974 and 1978. Average age, length of marriage, and number of living children prior to vasectomy were greater in the first group (P less than 0.01). The results are compatible with the idea that couples are planning smaller families and turning increasingly to vasectomy as a reliable permanent birth control method immediately following the completion of their families.
一组是1968年至1971年间接受手术的376名男性，另一组是1974年至1978年间接受手术的608名男性。第一组患者在输精管切除术前的平均年龄、婚姻时长和存活子女数量均更高（P小于0.01）。这些结果与以下观点相符，即夫妻们正计划生育更小的家庭，并在完成家庭生育后越来越多地将输精管切除术作为一种可靠的永久性避孕方法。
