Table 2.

Mean (SE) IQ levels according to maternal prenatal mercury levels divided at the 20th, 40th, 60th, 80th, and 90th centiles.

			Mean (SE)
Mercury μg/L	N	Verbal IQ	Performance IQ	Total IQ
All children
<1.28	321	104.4 (0.874)	96.4 (0.898)	100.9 (0.857)
1.28−1.68	394	105.2 (0.867)	98.5 (0.878)	102.4 (0.851)
1.69−2.10	424	108.3 (0.845)	100.5 (0.800)	105.3 (0.798)
2.11−2.74	442	108.3 (0.777)	101.7 (0.777)	106.0 (0.752)
2.75−3.39	239	110.7 (1.086)	99.1 (1.097)	106.1 (1.051)
> 3.39	244	111.7 (1.038)	103.5 (1.138)	108.9 (1.060)
P*		<0.0001	<0.0001	<0.0001
Children whose mothers ate fish
<1.28	198	103.8 (1.116)	94.9 (1.142)	99.8 (1.095)
1.28−1.68	310	105.9 (0.958)	98.4 (0.966)	102.7 (0.934)
1.69−2.10	376	109.0 (0.889)	100.8 (0.851)	105.9 (0.841)
2.11−2.74	398	108.8 (0.814)	101.9 (0.808)	106.4 (0.780)
2.75−3.39	219	110.9 (1.135)	99.3 (1.150)	106.4 (1.102)
> 3.39	230	111.7 (1.068)	104.1 (1.176)	109.3 (1.100)
P*		<0.0001	<0.0001	<0.0001
Children whose mothers ate no fish
<1.28	102	106.0 (1.518)	99.6 (1.534)	103.3 (1.456)
1.28−1.68	57	103.7 (2.384)	99.7 (2.658)	102.4 (2.534)
1.69−2.10	31	105.2 (3.297)	99.6 (2.962)	103.0 (3.109)
2.11−2.74	29	105.8 (3.154)	101.6 (3.224)	104.1 (3.193)
2.75−3.39	8	108.3 (5.028)	88.6 (4.196)	98.5 (4.149)
>3.39	5	111.2 (6.272)	95.2 (2.973)	104.6 (5.006)
P*		0.898	0.538	0.971

*P for trend.