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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: Neurotoxicol Teratol. 2009 Apr 2;31(4):225–231. doi: 10.1016/j.ntt.2009.03.002

Table 4.

Adjusted mean (SE) of IQ and school achievement scores among children with blood lead level < 10 μg/dL

Lead level
< 5 μg/dL ≥ 5 μg/dL p
4 year n=100 n=126
Full Scale IQ 83.74 (1.35) 81.55 (1.16) .23
 Performance 90.37 (1.48) 85.36 (1.25) .01
9 year n=98 n=123
Full Scale IQ 87.92 (1.31) 85.09 (1.13) .11
 Verbal comprehension 88.02 (1.28) 86.30 (1.12) .32
 Perceptual reasoning 92.57 (1.37) 87.84 (1.19) .01
WJTA Math 97.57 (1.20) 94.55 (1.06) .06
WJTA Reading 92.36 (1.49) 86.31 (1.32) .003
11 year n=95 n=121
Full Scale IQ 88.03 (1.33) 85.90 (1.14) .23
 Verbal comprehension 86.36 (1.19) 84.56 (1.03) .26
 Perceptual reasoning 93.29 (1.37) 90.68 (1.20) .16
 Working memory 91.54 (1.68) 89.72 (1.44) .41
WJTA Math 94.91 (1.37) 93.28 (1.20) .37
WJTA Reading 92.45 (1.41) 88.59 (1.22) .04