Table 1.

Criteria for including or excluding papers from this systematic review.

Include	Exclude
1. Study of total mercury, inorganic, organic, or methylmercury compounds.	1. Studies other compounds including ethylmercury.
2. Measures mercury in pregnant women.	2. Measures mercury in other populations.
3. Measures mercury concentrations in biological samples: blood (whole, erythrocyte, plasma, serum), urine, cord blood/tissue, placenta, or hair.	3. Uses any other measure of mercury exposure.
4. Measures neurodevelopmental functioning (i.e.: cognition, attention, memory, intelligence, fine/gross motor development, receptive/expressive language ability, communicative ability, social development, or overall neurodevelopment) in children aged 0 to 5 years old.	4. Measures neurodevelopmental functioning in older children or adults, or only measures diagnoses or symptoms of neurodevelopmental disorders.
5. Reports association between mercury and neurodevelopmental functioning	5. Does not report associations between mercury and specified outcomes.
6. Study reports results from multivariable analysis methods.	6. Study reports results only from univariable methods such as correlations or t-tests.