Table 1

Demographic characteristics of cases and controls

Cases n = 1842Controls n = 1986P
Sex
 Male1018 (55.3%)1076 (54.2%)0.50
 Female824 (44.7%)910 (45.8%)
Age
 <12 months64 (3.5%)81 (4.1%)0.07
 12–23 months138 (7.5%)189 (9.5%)
 2–5 years1020 (55.4%)1038 (52.3%)
 6–10 years408 (22.2%)466 (23.5%)
 11+ years212 (11.5%)212 (10.7%)
Race
 White1492 (81.0%)1720 (86.6%)<0.01
 Black109 (5.9%)94 (4.7%)
 Hispanic153 (8.3%)121 (6.1%)
 American Indian/Alaska Native19 (1.0%)13 (0.7%)
 Asian/Pacific Islander56 (3.0%)32 (1.6%)
 Other or Unknown13 (0.7%)6 (0.3%)
Maternal education
 ≤High school797 (43.3%)762 (38.4%)
 Some post-high school592 (32.1%)701 (35.3%)<0.01
 ≥College453 (24.6%)523 (26.3%)
Paternal educationa
 ≤High school676 (41.8%)638 (37.1%)
 Some post-high school480 (29.7%)510 (29.6%)<0.01
 ≥College462 (28.6%)574 (33.4%)
Income ($)
 <10,000217 (11.8%)176 (8.9%)<0.01
 10,000–19,999390 (21.2%)370 (18.6%)
 20,000–29,999433 (23.5%)475 (23.9%)
 30,000–39,999334 (18.1%)369 (18.6%)
 40,000–49,999204 (11.1%)221 (11.1%)
 50,000+250 (13.6%)357 (18.0%)
 Unknown14 (0.8%)18 (0.9%)
  • a Based on 1618 cases and 1722 matched controls who responded to paternal interview.