Table 1.

Demographic characteristics of participants in the New England Family Study (NEFS) and participants in the analysis sample

	All NEFS participants Percent (n) (n = 1625)	Analysis sample Percent (n) (n = 1311)
Age, Mean (SD)	39.1 (1.9)	39.1 (1.8)
Female sex	59.2 (962)	59.5 (780)
Race/ethnicity
White	83.5 (1354)	84.0 (1101)
Black	9.6 (155)	9.1 (119)
Other	7.0 (113)	6.9 (91)
Educational attainment
Less than high school or GED	11.4 (185)	10.8 (142)
High school degree	13.7 (222)	13.8 (181)
High school plus additional training	16.1 (262)	16.7 (219)
Some college	30.0 (488)	30.8 (404)
College graduate	28.8 (468)	27.8 (365)
Number of siblings per family
1	56.8 (923)	60.5 (793)
2	34.5 (560)	32.8 (430)
3	7.2 (117)	5.7 (75)
4	1.2 (20)	0.6 (8)
5	0.3 (5)	0.4 (5)