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Table 1 Characteristics of participants in the Autism Internet Research Survey 2005.

From: Breastfeeding, infant formula supplementation, and Autistic Disorder: the results of a parent survey

  Cases Controls
For children aged 2–18 years: N = 861 N = 123
  Mean (SD) Mean (SD)
Age (years) 7.8 (3.9) 7.4 (4.5)
  % %
No breastfeeding 28 16
Breastfeeding <2 months 23 20
Breastfeeding 2–6 months 19 22
Breastfeeding >6 months 25 36
Unknown 5 6
Parental report of regression in their child's development 25 ---
For children aged 2–4 years: N = 150 N = 38
  Mean (SD) Mean (SD)
Age (years) 3.2 (0.5) 3.0 (0.6)
  % %
Exclusive breastfeeding (no infant formula use) 8 16
Infant formula with DHA/ARA 26 58
Infant formula without DHA/ARA 43 18
Other infant formula (DHA/ARA content unknown) 17 3
Unknown 6 5
Parental report of regression in their child's development 23 ---