Assessment of Hair Aluminum, Lead, and Mercury in a Sample of Autistic Egyptian Children: Environmental Risk Factors of Heavy Metals in Autism

Table 2

Comparison between studied groups as regards perinatal data.

	Group				P
	Cases		Controls
	Range	Mean ± SD	Range	Mean ± SD
Breast feeding (months)	2.0–24.0	13.5 ± 7.2	2.0–24.0	17.1 ± 4.9	0.001
Weaning (months)	2.0–18.0	6.1 ± 3.1	4.0–7.0	5.7 ± 0.9	0.292
Age of mother at conception (years)	17.0–40.0	26.5 ± 4.5	19.0–31.0	24.7 ± 3.0	0.005

Student’s -test.