Table 3.

Sample means and standard deviations, non-weighted

Variable	Mean	Standard deviation
Black	0.110	0.313
Other race	0.058	0.233
Hispanic	0.084	0.277
Married, spouse present	0.726	0.446
Potential years of experiencea	6.012	4.984
Education: less than high school degree	0.051	0.219
Education: high school degree	0.267	0.443
Education: some college	0.378	0.485
Education: college degree or higher	0.304	0.460
Completed schooling after first birth	0.226	0.418
Age at first birth < 20	0.117	0.321
Age at first birth 20–24	0.307	0.461
Age at first birth 25–29	0.337	0.473
Age at first birth 30–34	0.178	0.383
Age at first birth 35–39	0.051	0.219
Age at first birth 40+	0.011	0.102
Birth cohort 1935–1944	0.002	0.049
Birth cohort 1945–1949	0.012	0.109
Birth cohort 1950–1954	0.065	0.247
Birth cohort 1955–1959	0.166	0.372
Birth cohort 1960–1964	0.235	0.424
Birth cohort 1965–1969	0.209	0.407
Birth cohort 1970–1974	0.171	0.376
Birth cohort 1975–1979	0.099	0.299
Birth cohort 1980–1984	0.038	0.192
Birth cohort 1985–1989	0.002	0.043
Log of income in survey year	6.247	2.638
Log of other household income in survey year	6.487	3.275
Moved since first birth	0.756	0.429
Took paid maternity leave	0.324	0.468
Field: Noneb	0.514	0.500
Field Agriculture/Forestry	0.015	0.121
Field Art/Architecture	0.009	0.092
Field Business/Management	0.126	0.332
Field Education	0.071	0.256
Field Engineering/Technical	0.009	0.093
Field Languages	0.033	0.179
Field Health	0.075	0.263
Field Math/Statistics	0.004	0.065
Field Social Sciences	0.026	0.158
Field Professional	0.012	0.107
Field Police/Vocational	0.008	0.088
Field Cosmotology/Home Economics	0.011	0.103
Field Other	0.088	0.284
Observations = 7,961

^aCalculated as age at birth—years of education—6

^bField only available if individual holds a degree from vocational, bachelors or higher order professional training