Table 4. Impact of blood concentrations of lead on IQ and school performance in Chinese preschool children (n = 1341).
Blood concentrations of lead (µg/dL) | |||
<8.0 | 8.0 – <10.0 | ≥10.0 | |
IQ (Model 1) | |||
PIQ | Ref | −0.96 (−3.28, 1.36) | −1.90 (−4.89, 1.09) |
VIQ | Ref | −0.48 (−3.36, 2.40) | −1.77 (−4.01, 0.46) |
FIQ | Ref | −1.28 (−4.01, 1.46) | −1.45 (−3.50, 0.67) |
School performance | |||
Chinese: Model 1 | Ref | −3.20 (−5.78, −0.63)* | −4.02 (−7.11, −0.93)* |
Model 2 | Ref | −2.67 (−5.16, 0.18)* | −3.60 (−6.58, −0.62)* |
Math: Model 1 | Ref | −5.25 (−8.14, −2.36)** | −5.27(−8.73, −1,81)** |
Model 2 | Ref | −4.46(−7.20, −1.72)** | −4.64(−7.91, −1.36)** |
English: Model 1 | Ref | −4.33 (−7.32, −1.34)* | −5.18 (−8.76, −1.59)** |
Model 2 | Ref | −3.62 (−6., −0.75)* | −4.62 (−8.05, −1.18)* |
p<.05,
p<.01.
Model 1: Adjusting for age at blood lead test, sex, blood iron, school, father's education, mother's education, father's occupation and smoking.
Model 2: Adjusting covariates in model 1 plus PIQ.