Table 3.
Unadjusted associations between covariates and tooth Pb (ln 208Pb:43Ca) around time of birtha
| N | Beta (95% CI) | |
|---|---|---|
| Child sex, female vs. male | 138 | −0.01 (−0.28, 0.26) |
| Gestational age at birth (wks) | 135 | 0.04 (−0.04, 0.13) |
| Preterm birth (<37 wks gestation) vs. normal | 135 | −0.35 (−0.93, 0.23) |
| Birth weight (g) | 135 | 0.26 (−0.05, 0.58) |
| Mother’s age at birth (yrs) | 131 | 0.03 (0.001, 0.05) |
| ≥30 yrs old vs. <30 | 131 | 0.18 (−0.12, 0.47) |
| Mother’s education, <12 yrs school vs. ≥12 yrs | 130 | 0.08 (−0.20, 0.36) |
| Mother’s IQ score | 120 | 0.0004 (−0.007, 0.008) |
| Mother smoked during pregnancy, yes vs. no | 117 | −0.43 (−1.62, 0.75) |
| Hemoglobin at 1 yr of age (g/dl) | 95 | 0.06 (−0.06, 0.19) |
| Hemoglobin at 2 yrs of age (g/dl) | 111 | −0.06 (−0.19, 0.07) |
| Anemic at 1 or 2 years of age, yes vs. no | 127 | −0.02 (−0.31, 0.26) |
| Study cohort (years of child birth) | ||
| 1 (1994–1995) vs. 3 (2001–2006) | 2 | 0.09 (−1.02, 1.20) |
| 2A (1997–2002) vs. 3 (2001–2006) | 19 | 0.38 (−0.01, 0.77) |
| 2B (1998–2001) vs. 3 (2001–2006) | 33 | 0.41 (0.10, 0.73) |
a
Around time of birth defined as birth ± 3 days