Table 5.

Results from studies identified as high quality which measured cognition (n = 7).

Study	n	Exposure	Units	Outcome	Time of Outcome	Estimate	95% CI	p-Value
Barbone et al. (2019)	1083	Hair	ng/g	Bayley-III: Cognitive composite	18 months	0.2	−0.29 to 0.69
Barbone et al. (2019)	829	Umbilical cord	ng/g	Bayley-III: Cognitive composite	18 months	0.13	−0.39 to 0.64
Barbone et al. (2019)	636	Whole blood	ng/g	Bayley-III: Cognitive composite	18 months	−0.09	−0.61 to 0.43
Boucher et al. (2014)	77	Umbilical cord	ln μg/L	A-not-B: 2 correct	11 months	−0.25	−0.46 to 0.00
Boucher et al. (2014)	77	Umbilical cord	ln μg/L	A-not-B: 3 correct	11 months	−0.22	−0.45 to 0.03
Boucher et al. (2014)	73	Umbilical cord	ln μg/L	Perseverative errors	11 months	−0.21	−0.53 to 0.09
Boucher et al. (2014)	89	Umbilical cord	ln μg/L	FTII: Novelty preference	6.5 months	0.0	−0.19 to 0.19
Boucher et al. (2014)	89	Umbilical cord	ln μg/L	FTIII: Fixation duration	6.5 months	0.13	−0.03 to 0.29
Lin et al. (2013)	230	Umbilical cord	Hg ≥ 19.78 μg/L	CDIIT: Cognitive	24 months	0.09		NS
Nisevic et al. (2019)	257	Umbilical cord	μg/L	Bayley-III: Cognitive composite	18 months	0.14		0.34
Oken et al. (2008)	341	Erythrocyte	ng/g	WRAVMA matching	36 months	−0.2	−0.6 to 0.2
Valent et al. (2013)	505	Hair	Ln ng/g	Bayley-III: Cognitive composite	18 months	−0.002		0.99
Valent et al. (2013)	378	Umbilical cord	Ln ng/g	Bayley-III: Cognitive composite	18 months	0.05		0.92
Xu et al. (2016)	270	Umbilical cord	μg/L	NNNS: Attention	5 weeks	0.12		0.23
Xu et al. (2016)	344	Whole blood	μg/L	NNNS: Attention	5 weeks	0.15		0.22