Table 1.

Characteristics of subjects and their families

CharacteristicsCases, N (%)*Controls, N (%)*
Sex of child
    Male214 (67.1%)214 (67.1%)
    Female105 (32.9%)105 (32.9%)
Race of child
    White284 (89.0%)288 (90.3%)
    Black20 (6.3%)21 (6.6%)
    Other15 (4.7%)10 (3.1%)
Mother's educational level
    Less than high school45 (14.1%)38 (12.0%)
    High school132 (41.4%)126 (39.7%)
    More than high school142 (44.5%)153 (48.3%)
Father's educational level
    Less than high school54 (17.1%)36 (11.6%)
    High school112 (35.3%)111 (35.8%)
    More than high school151 (47.6%)163 (52.6%)
Total annual family income
    $0-19,999103 (32.8%)75 (23.9%)
    $20,000-39,999129 (41.1%)154 (49.0%)
    $40,000+82 (26.1%)85 (27.1%)
Age at diagnosis of index child
    Child7.6 (5.3)7.5 (5.5)
    Maternal33.8 (6.8)33.8 (7.0)
    Paternal36.6 (7.5)36.6 (8.0)
  • * Percentage of respondents to each question (excluding unknowns).

  • Mean (SD).