Table 1.

Percent distribution of person-month records by respondents’ sociodemographic and reproductive characteristics.

	Female sample (N=1,439,980)		Male sample (N=1,253,038)
	Percentage	95% CI	Percentage	95% CI
Marital status
Never-married single	41.7%	40.1% – 43.2%	52.8%	51.2% – 54.5%
Ever-married single	4.7%	4.2% – 5.2%	4.0%	3.4% – 4.5%
Never-married cohabitation	7.6%	6.9% – 8.2%	6.5%	5.8% – 7.2%
Ever-married cohabitation	1.8%	1.4% – 2.1%	1.3%	1.0% – 1.6%
First-order marriage	41.0%	39.5% – 42.5%	32.4%	30.8% – 34.0%
Higher-order marriage	3.3%	2.8% – 3.9%	3.0%	2.4% – 3.6%
Parity
0	55.5%	53.7% – 57.3%	65.8%	64.0% – 67.5%
1	21.3%	20.2% – 22.3%	16.5%	15.6% – 17.4%
2	15.2%	14.3% – 16.1%	11.6%	10.5% – 12.7%
3+	8.0%	7.1% – 9.0%	6.1%	5.4% – 6.9%
Early childbearing
No early birth	93.7%	92.9% – 94.6%	98.1%	97.6% – 98.6%
First birth before age 18	6.3%	5.4% – 7.1%	1.9%	1.4% – 2.4%
Education
Less than high school	14.1%	12.3% – 16.0%	19.4%	17.3% – 21.5%
High school	51.2%	48.9% – 53.5%	52.2%	49.6% – 54.7%
Bachelor's degree	34.7%	31.9% – 37.4%	28.4%	25.8% – 31.1%
Nativity
Native-born	81.9%	79.7% – 84.2%	81.6%	79.3% – 83.8%
Foreign-born	18.1%	15.8% – 20.3%	18.4%	16.2% – 20.7%
Race and ethnicity
Non-Hispanic white	62.9%	59.4% – 66.4%	61.5%	57.6% – 65.4%
Hispanic	16.0%	12.8% – 19.3%	18.4%	14.6% – 22.2%
Non-Hispanic black	12.3%	10.5% – 14.2%	11.0%	8.9% – 13.0%
Other	8.8%	7.0% – 10.5%	9.1%	7.2% – 11.1%
Period
1975–1994	27.4%	26.3% – 28.6%	25.6%	24.4% – 26.7%
1995–2010	72.6%	71.4% – 73.7%	74.4%	73.3% – 75.6%

Note: The distribution of the female and male analytic samples by age at the time of interview is: 7.7% of females and 7.2% of males of ages 18–24 years, 14.5% of females and 14.3% of males of ages 25–29 years, 18.5% of females and 18.5% of males of ages 30–34 years, 27.9% of females and 27.0% of males of ages 35–39 years, and 31.4% of females and 33.0% of males of ages 40–44 years.

CI = confidence interval.