Lapham R J, Mauldin W P
Stud Fam Plann. 1985 May-Jun;16(3):117-37.
Estimates of contraceptive prevalence for the period 1977-1983 are presented for 73 less developed countries. Socioeconomic conditions are associated with much of the variance in prevalence, but organized family planning programs strengthened this association significantly. The average percent of couples in the reproductive ages practicing fertility regulation is 26, with the range from 4 to 55 percent between the low and high socioeconomic groups of countries, and from 7 to 59 percent between groups of countries with very weak (if any) to strong family planning program effort.
本文给出了73个欠发达国家1977 - 1983年期间的避孕普及率估计数据。社会经济状况与普及率的大部分差异相关，但有组织的计划生育项目显著强化了这种关联。育龄夫妇实施生育调控的平均比例为26%，在社会经济水平较低和较高的国家组别之间，这一比例在4%至55%之间；在计划生育项目力度非常弱（若有）至力度强的国家组别之间，这一比例在7%至59%之间。
