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Table 1 Characteristics of siblings in the National Survey of Midlife Development in the United States (N = 2560).

From: Concordance of sibling's recall of measures of childhood socioeconomic position

Age, years * 46.7 ± 12.5
Women, n % 1419 (55.4)
White, n % 2282 (89.1)
Black, n % 54 (2.1)
Other, n % 224 (8.8)
Education < high school graduate, n % 188 (7.3)
High school graduate, n % 743 (29.0)
Some college, n % 772 (30.2)
College graduate, n % 857 (33.5)
Household income, dollars 60,000 (33,500 - 100,500)
Twin, n % 1608 (62.8)
Reported on biological father, n % 2388 (93.3)
Reported on biological mother, n % 2514 (98.2)
  1. * Mean ± standard deviation
  2. Median (25th, 75th percentile)