Table 1 Demographic characteristics, Ontario birth cohort Apr 2006- Nov 2012, children with carrier status for HbS, HbC, HbD, or HbE versus children with screen negative newborn screening results
|  | Carriers N = 4987 n (%) | Matched population controls N = 24,935 n (%) |
|---|---|---|
Sexa | ||
 Male | 2472 (50) | 12,646 (51) |
 Female | 2515 (50) | 12,289 (49) |
Birth weighta | ||
  < 2500 g | 410 (8) | 1665 (7) |
  ≥ 2500 g | 4549 (92) | 23,138 (93) |
Gestational agea | ||
  < 37 weeks | 428 (9) | 1920 (8) |
  ≥ 37 weeks | 4490 (91) | 22,433 (92) |
Socioeconomic statusa | ||
  ‘Lower’ | 2992 (60) | 13,679 (55) |
  ‘Higher’ | 1960 (40) | 11,220 (45) |
Survival (to end-study) | ||
 Yes | 4975 (99.8) | 24,867 (99.7) |
 No | 12 (0.2) | 68 (0.3) |