Table 1.

Summary of SIPP Panels and Birth Sample

	2004–2008 Panels		1996 Panel		1984–1986 Panels
A: Summary information on 1984–1986, 1996, 2004–2008 SIPP panels
Waves	12		12
Dates	February 2004–August 2012		April 1996– March 2000		October 1983– April 1988
Householdsa	43540		36730		45105
Women (eighteen to forty-five)	25317		24102		31316
Births (eighteen to forty-five)	6,284		3,395		3,670
First	2,621	42.8%	1,486	43.9%	1,987	53.9%
Subsequent	3,663	57.2	1,909	56.1	1,683	46.1
B: Summary characteristics of birth sample (mothers age eighteen to forty-five) (Unweighted numbers of observations, weighted percentages)
Race
White	3,964	59.5%	2,222	63.0%	2,874	77.2%
Black	760	13.1	449	14.5	480	14.8
Hispanic	1,043	19.4	564	17.8	178	4.4
Other	517	8.0	160	4.6	138	3.6
Marital status
Married spouse present	4,218	69.4	2,440	73.8	2,944	80.5
Separated, divorced, widowed	426	5.8	255	6.5	249	6.6
Never married	1,640	24.8	700	19.8	477	13.0
Educationb
Less than bachelor’s	4,377	68.9	2,577	75.3	3,054	83.1
High school or less	2,363	37.0	1,601	46.2	1,809	49.2
Some collegec	2,014	31.9	976	29.1	1,245	33.9
Bachelor’s only	1,305	21.2	663	20.2	386	10.5
Master’s plus	602	9.9	155	4.5	230	6.4
Master’s	450	7.4	114	3.3
Professional	89	1.4	25	0.7
PhD	63	1.0	16	0.5
At least bachelor’s	1907	31.1	818	24.7	616	16.9

Source: Author’s calculations based on the Survey of Income and Program Participation (1984, 1985, 1986, 1996, 2004, and 2008 panels).

Notes: The sample includes all women ages eighteen to forty-five who give birth during one of the SIPP panels. For time-varying characteristics like education, the reference level is the level in the month that a woman gives birth.

^aThe number of households and number of women in the full panel based on the total number that appear in the survey as opposed to the number appearing in wave 1.

^bAmbiguity in 1980s coding of education variables makes it impossible to make an exact distinction between some college, bachelors, and graduate degree.

^cIncludes associates and vocational degrees.