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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

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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

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