Table 3. Mean IQ and 2009 school performance by blood concentrations of lead in preschool children.

	Blood concentrations of lead (µg/dL)			ANOVA		Post-hoc analysis, LSD (p)
	<8 (A)	8- <10(B)	≥10 (C)	F	p	A vs. B	A vs. C	B vs. C
IQ	N = 1016	N = 182	N = 103
PIQ	104.46(14.93)	103.32(15.58)	100.75(16.03)	3.04	.048	.349	.018	.168
VIQ	104.23(14.80)	103.65(15.03)	103.08(14.65)	0.36	.696	.627	.453	.755
FIQ	104.55(14.36)	103.66(14.22)	101.86(15.25)	1.78	.169	.442	.072	.313
School performance	N = 421	N = 79	N = 49
Chinese	89.33(9.20)	83.44(13.97)	82.12(16.67)	17.30	.000	.000	<.001	.503
Math	90.32(9.20)	84.29(14.66)	83.04(19.42)	16.32	.000	.000	<.001	.545
English	91.29(10.41)	84.16(18.10)	83.37(19.71)	16.59	.000	.000	<.001	.732