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

Table 4

The relationship between risk factors and mercury level among cases.

Variables	Mercury level (mg/kg)		P
	Range	Mean ± SD
Age group
<6 years	0.087–1.744	0.43 ± 0.34	0.101
≥6 years	0.008–0.911	0.32 ± 0.22
Dental amalgam
Positive	0.087–0.773	0.33 ± 0.20	0.492
Negative	0.008–1.744	0.38 ± 0.31
Rho(D) immune globulin
Positive	0.117–0.149	0.13 ± 0.02	0.239
Negative	0.008–1.744	0.37 ± 0.28
Fish consumption
None	0.008–0.830	0.26 ± 0.24	0.026
Once per month	0.113–0.911	0.34 ± 0.21
2–4 times per month	0.074–0.882	0.37 ± 0.24
>4 times per month	0.285–1.744	0.74 ± 0.68

Student’s -test; ANOVA, statistically significant (P < 0.05).