. Author manuscript; available in PMC: 2014 Apr 25.

Published in final edited form as: Obstet Gynecol. 2012 Dec;120(6):1291–1297. doi: 10.1097/aog.0b013e318273eb56

Table 3.

Abortion Rates per 1,000 Women and Adolescents in CHOICE, St. Louis, and the United States, and Estimated Population Effect of the Contraceptive CHOICE Project

Year	CHOICE vs. St. Louis Region (City and County)						National Rate^\|\|
	CHOICE Rate^*	Region Rate^†	P	Abortions Prevented^‡	Number Treated to Prevent One Abortion
	CHOICE Rate^*	Region Rate^†	P	Abortions Prevented^‡	NNT^§	95% CI
2008	4.4	17.0	<0.001	3124	79	44–255	19.6
2009	7.5	14.8	<0.001	1810	137	97–224	NA
2010	5.9	13.4	<0.001	1860	133	99–213	NA

NNT, number needed to treat; CI, confidence interval; NA, not applicable.

Among Black and White, aged 15–44, adjusting for age and race using 2010 census data

^†

Among Black and White, aged 15–44, denominator is 2010 census data

^‡

CHOICE compared to St. Louis rate, number of abortions prevented in St. Louis city or county.

^§

CHOICE compared to St. Louis rate, number needed to treat to prevent one abortion.

^||

Among all races aged 15–44.