Table 2.

Age-adjusted associations of breastfeeding and autistic disorder for children aged 2–18 years.

Variable	Odds Ratio	(95% Confidence Interval)	p value
No Breastfeeding	2.48	(1.42 – 4.35)	0.001
Breastfeeding <2 months	1.70	(1.00 – 2.88)	0.050
Breastfeeding 2–6 months	1.27	(0.75 – 2.14)	0.373
Breastfeeding >6 months	reference
Limited to cases with reported regression in development
No Breastfeeding	1.95	(1.01 – 3.78)	0.048
Breastfeeding <2 months	1.84	(0.98 – 3.44)	0.057
Breastfeeding 2–6 months	1.59	(0.86 – 2.96)	0.141
Breastfeeding >6 months	reference