Table 4:

Correlations between measured log(Hg) and imputed log(Hg) at each visit age among SCDS Main Cohort participants, stratified by the number of measured Hg values available at the three similar ages identified for calculating the imputed Hg value at that age.

	Any # measures		3 measures		2 measures		1 measure
	n	corr	n	corr	n	corr	n	corr
6 months	695	0.36	621	0.34	39	0.41	35	0.56
19 months	736	0.35	449	0.29	239	0.47	48	0.30
66 months	706	0.44	449	0.47	227	0.42	30	0.37
9 years	513	0.47	356	0.47	86	0.43	71	0.49
17 years	541	0.45	383	0.45	112	0.50	46	0.36
19 years	476	0.45	383	0.50	63	0.27	30	0.24
22 years	555	0.57	383	0.58	112	0.58	60	0.43
24 years	551	0.60	383	0.59	112	0.65	56	0.50