Serum Persistent Organic Pollutants and Duration of Lactation among Mexican-American Women
Table 4
Relationships between log-transformed persistent organic pollutant (POP) concentrations in maternal blood drawn at 26 weeks gestation and hazard of weaning.
Interaction of breastfeeding history and POPs
Unadjusted
Adjusted
Did not Breastfeed Previously
Breastfed Previously
N
HR (95% CI)
HR (95% CI)
HR (95% CI)
HR (95% CI)
366
0.9 (0.7, 1.1)
0.9 (0.7, 1.1)
0.6
1.1 (0.8,1.4)
366
0.9 (0.8, 1.0)
0.9 (0.8, 1.1)
0.8 (0.7, 1.1)
1.0 (0.8, 1.2)
364
0.9 (0.7, 1.0)
0.9 (0.8, 1.1)
0.9 (0.6, 1.1)
0.9 (0.7, 1.2)
.59
364
1.0 (0.8, 1.3)
1.2 (1.0, 1.6)
1.1 (0.8, 1.5)
1.2 (0.9, 1.7)
.68
366
1.3 (0.9, 1.7)
1.3 (1.0, 1.8)
1.4 (0.9, 2.3)
1.2 (0.8, 1.8)
.55
326
1.0 (0.7, 1.4)
1.0 (0.7, 1.4)
1.5 (0.8, 2.9)
0.8 (0.5, 1.3)
.12
343
0.8 (0.6, 1.2)
0.8 (0.6, 1.2)
1.2 (0.6, 2.1)
0.7 (0.5, 1.1)
.22
362
0.8 (0.6, 1.2)
0.9 (0.6, 1.2)
1.1 (0.6, 2.0)
0.8 (0.5, 1.2)
.43
342
1.4 (0.9, 2.2)
1.5 (0.9, 2.4)
1.0 (0.5, 2.1)
1.5 (0.8, 2.9)
.41
334
1.5 (1.0, 2.2)
1.8
1.1 (0.6, 2.0)
2.2
.11
348
1.4 (1.0, 2.1)
1.5 (1.0, 2.4)
1.0 (0.5, 2.0)
1.6 (0.8, 3.0)
.30
284
1.3 (0.9, 2.0)
1.6
1.1 (0.6, 2.0)
2.1
.11
for mother's age at delivery, years living in the United States and marital status; for mother's age at delivery, years living in the United States; for mother's age at delivery, years living in the United states, marital status, and maternal prepregnancy Body Mass Index; for mother's age at delivery and marital status; for mother's age at delivery; -value for the interaction of breastfeeding history and POP. Abbreviations: Persistent organic pollutant (POP), sample size (N), Hazard Ratio (HR), Confidence Interval (CI), dichlorodiphenyldichloroethylene (DDE), dichlorodiphenyltrichloroethane (DDT), hexachlorocyclohexane (HCCH), hexachlorobenzene (HCB), polychlorinated biphenyl (PCB).,
