DeStefano F, Greenspan J R, Ory H W, Peterson H B, Maze J M, Smith J C
Am J Public Health. 1982 May;72(5):480-4. doi: 10.2105/ajph.72.5.480.
In the period 1970-1977, an estimated 4,236,000 women 15-44 years of age had tubal sterilization operations in United States hospitals. Both the number and the rate of tubal sterilizations increased each year from 1970-1977, but in 1978 both declined. Tubal sterilization rates for Black women were higher than for White women. Black women also tended to be younger at the time of tubal sterilization. For the nation as a whole, the mean age at the time of tubal sterilization remained constant at about 30 with the youngest age group having the highest proportion of never-married women.
在1970年至1977年期间，估计有423.6万名15至44岁的女性在美国医院接受了输卵管绝育手术。1970年至1977年期间，输卵管绝育手术的数量和比率每年都在增加，但在1978年两者都有所下降。黑人女性的输卵管绝育率高于白人女性。黑人女性在进行输卵管绝育时的年龄也往往更小。就全国而言，输卵管绝育时的平均年龄保持在30岁左右不变，最年轻的年龄组中从未结婚的女性比例最高。
