Table 1:

Levels of Hg in ASD patients: examples of case-control studies.

Hg levels	Sample	Country	Reference
Control: 0.30 μg/g Autism: 4.50 μg/g	Hair	Kuwait	Fido and Al-Saad 2005
Control: 0.37 μg/g Autism: 1.61 μg/g	Hair	India	Priya and Geetha 2011
Control: 2.87 μg/g Autism: 4.02 μg/g	Nail	India	Priya and Geetha 2011
Control: 0.07 μg/g Autism: 0.15 μg/g	Baby teeth	United States	Adams et al. 2007
Control: 0.25 μg/g Autism: 0.39 μg/g	Hair	Egypt	Mohamed et al. 2015
Control: 0.12 μg/g Autism: 0.79 μg/g	Hair	Egypt	El-baz et al. 2010
Control: 2.71 μg/g Autism: 3.66 μg/g	Red Blood Cells	Saudi Arabia	El-Ansary et al. 2017
Control: 13.47 μg/L Autism: 55.59 μg/L	Blood	China	Li et al. 2018
Control: 12.08 μg/L Autism: 32.90 μg/L	Blood	Egypt	Khaled et al. 2016
Control: 0.60 μg/g Autism: 7.00 μg/g	Hair	Oman	Hodgson et al. 2014