Ezzard N V, Cates W, Kramer D G, Tietze C
Am J Public Health. 1982 Aug;72(8):809-14. doi: 10.2105/ajph.72.8.809.
Between 1972 and 1978, as legal abortion became more widely available nationally, abortion rates (abortions per 1,000 women) and ratios (abortions per 1,000 live births) increased for all American teenagers; from 1972 to 1975, the rates and ratios for teenagers for Black and other races increased faster than those for White teenagers. For all seven years, abortion rates were higher for teenagers of Black and other races than for white teenagers. This reflected both higher proportions of sexually active teenagers of Black and other races and a greater risk of pregnancy in these teenagers compared with White teenagers. Race-specific differences in legal abortion ratios narrowed during the seven-year interval, as did differences in alternative outcomes of teenage premarital pregnancies (term births, illegal abortions).
1972年至1978年间，随着合法堕胎在全国范围内更加普及，所有美国青少年的堕胎率（每1000名女性中的堕胎数）和堕胎比（每1000例活产中的堕胎数）都有所上升；1972年至1975年，黑人及其他种族青少年的堕胎率和堕胎比增长速度快于白人青少年。在这七年中，黑人及其他种族青少年的堕胎率一直高于白人青少年。这既反映出黑人及其他种族性活跃青少年的比例更高，也反映出与白人青少年相比，这些青少年怀孕的风险更大。在这七年期间，合法堕胎比的种族差异缩小了，青少年婚前怀孕的其他结果（足月分娩、非法堕胎）的差异也缩小了。
