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Correlation matrixa for mother–infant lead biomarkers, Mexico City, 1997–1999.
| Biomarker of lead exposure | Breast milkb | Bloodb | Plasmab | Bloodc |
|---|---|---|---|---|
| aSpearman correlation coefficients (ρ); prob > |r| under H0: ρ = 0. bMaternal: sample collected 1 month postpartum, n = 81. cInfant blood: sample collected at 3 months of age, n = 60. *p < 0.0001. **p < 0.01. | ||||
| Maternal | ||||
| Breast milk | 1.00 | 0.44* | 0.31** | 0.34** |
| Blood | 1.00 | 0.76* | 0.65* | |
| Plasma | 1.00 | 0.44** | ||
| Infant blood | 1.00 | |||
