Table 3.

Probability of failure within the first 12 months of use by socioeconomic characteristics of users in the United States: weighted data corrected for underreporting of abortion in the 1995 and 2002 NSFG

	1995		2002		Difference
		95%		95%	1995/2002:
	Proba- bility	Confidence interval	Proba- bility	Confidence interval	p-value
Age
<20	15.6	(12.9 – 18.7)	13.1	(10.6 – 16.0)	0.278
20–24	17.1	(14.5 – 20.1)	14.3	(12.0 – 17.1) *	0.248
25–29	14.6	(12.0 – 17.7)	14.9	(12.2 – 18.1) *	0.473
30+	11.9	(9.7 – 14.6)	8.2	(6.4 – 10.4)	0.144
Race/Ethnicity
Black	23.9	(20.7 – 27.5) *	21.3	(17.8 – 25.2) *	0.310
Hispanic	18.4	(14.8 – 22.6)	15.0	(12.3 – 18.2)	0.261
White/Others	12.6	(11.1 – 14.4)	10.1	(8.7 – 11.7)	0.149
Intention status
Did not intend more	14.3	(12.0 – 17.0)	9.2	(7.5 – 11.3) *	0.068
Intended more/Don't know	15.1	(13.5 – 16.8)	13.9	(12.4 – 15.6)	0.309
Parity (previous births)
0	14.3	(12.4 – 16.6)	6.2	(4.8 – 7.8)	0.002
1	15.9	(13.3 – 18.7)	18.0	(15.2 – 21.0) *	0.310
2 or more	14.8	(12.5 – 17.4)	16.3	(14.1 – 18.7) *	0.338
Poverty status
<100%	25.5	(21.7 – 29.7) *	19.9	(19.3 – 20.6) *	0.094
100 – 199%	17.3	(14.4 – 20.7)	17.8	(17.3 – 18.4) *	0.442
200% or more	11.6	(10.1 – 13.3)	8.4	(7.1 – 9.9)	0.079
Union status
Cohabiting	28.7	(23.3 – 34.8) *	21.7	(18.3 – 25.5) *	0.165
Formerly married	23.1	(17.6 – 29.8) *	12.2	(8.2 – 17.9)	0.108
Never married	15.4	(13.3 – 17.7) *	11.5	(9.6 – 13.7)	0.110
Married	10.4	(8.7 – 12.3)	9.5	(7.9 – 11.5)	0.376

^*subgroup estimate is significantly different from reference group at p < .0.5

Note: For comparisons of statistically significant differences between subgroups within year, the siginficance for each group is measured relative to the reference group, indicated by italics (e.g., significance for younger age groups are relative to those ages 30+).