TABLE 4.

Combined influence of maternal dietary intake of PUFA and SFA on the relationship between lead levels in patella and breast milk¹,²

Variable	Parameter estimate ± SE
Intercept	−0.34 ± 0.17*
Patella lead3, µg/g	0.02 ± 0.007 *
PUFA, g/d
1st tertile	Reference
2nd tertile	0.26 ± 0.13*
3rd tertile	0.50 ± 0.13***
SFA, g/d
1st tertile	Reference
2nd tertile	0.08 ± 0.13
3rd tertile	0.07 ± 0.14
Patella lead × PUFA
1st tertile	Reference
2nd tertile	−0.005 ± 0.007
3rd tertile	−0.02 ± 0.007**
Patella lead × SFA
1st tertile	Reference
2nd tertile	−0.0004 ± 0.007
3rd tertile	0.005 ± 0.007

¹n = 277. Six outliers, identified using Cook’s D statistic, were excluded from analysis. Value is significantly different from parameter estimate for reference group:

^*P < 0.05

^**P < 0.01

^***P < 0.001.

²Model adjusted for breast-feeding practice (partial vs. exclusive), previous pregnancies (none, 1, and ≥2), infant weight change (g), maternal dietary calcium intake (≥1000 mg/d vs. <1000 mg/d), and maternal total fat intake (g/d). Adjusted R² = 0.149.

³SI unit conversion factor: patella lead (µmol/g) = 0.004826.