Serum Persistent Organic Pollutants and Duration of Lactation among Mexican-American Women

Table 5

Adjusted^𝑎 associations of endocrine-disrupting POPs summarized by principal component analysis and duration of lactation, stratified by breastfeeding history.

	Did not Breastfeed previously			Breastfed previously
	HR	(95% CI)	P	HR	(95% CI)	P	𝑃interaction
Estrogenic^b	1.0	(0.9, 1.1)	.53	1.0	(0.9, 1.0)	.28	.24
Anti-estrogenic^c	1.0	(0.9, 1.1)	.79	1.1	(1.0, 1.3)	.03	.13
Androgenic^d	1.0	(0.9, 1.2)	.54	1.1	(0.9, 1.3)	.28	.67
Anti-androgenic^e	1.0	(0.9, 1.1)	.63	1.0	(1.0, 1.1)	.49	.42

^aAll model were adjusted for mother's age at delivery, years living in the United States, and marital status. ^bEstrogenic chemicals include p,𝑝^-DDE, p,𝑝^-DDT, o,𝑝^-DDT, b-HCCH, HCB, PCB 44, PCB 49, PCB 52, PCB153. ^cAntiestrogenic chemicals include HCB, PCB 118, PCB 138, PCB 153, PCB 180. ^dAndrogenic chemicals include HCB, PCB 118. ^eAntiandrogenic chemicals include p,𝑝′-DDE, p,𝑝^-DDT, o,𝑝′-DDT, HCB, PCB 118, PCB 138.