Serum Persistent Organic Pollutants and Duration of Lactation among Mexican-American Women
Table 3
Median duration of lactation from Kaplan-Meier plots by quartiles of persistent organic pollutant concentrations for all participants and stratified by breastfeeding history, Salinas, California, 1999-2000.
Median duration of lactation (months)
N
Quartile
n
Exposure (ng lipid)
Exposure Median (ng lipid)
All Participants
Did not Breastfeed Previously
Breastfed Previously
Overall
6.0
4.0
7.0
366
1
92
48.8–568.9
406.8
5.0
2.0
7.0
2
91
572.2–1059.9
808.8
6.0
3.0
7.5
3
92
1067.6–2697.9
1531.5
6.0
6.0
5.0
4
91
2801.6–159303.3
7022.2
8.0
5.0
10.0
366
1
92
1.6–7.0
4.7
5.0
3.0
5.5
2
91
7.1–12.7
9.6
7.0
5.0
10.0
3
92
12.8–35.5
19.0
6.0
3.0
6.5
4
91
39.3–33174.0
201.8
7.0
5.0
8.0
364
1
91
0.1–0.7
0.5
5.0
2.0
7.0
2
91
0.7–1.3
0.9
6.5
7.0
5.5
3
91
1.3–3.1
1.8
7.0
4.5
9.0
4
91
3.1–1878.1
8.1
6.0
4.0
7.0
364
1
91
0.1–19.2
7.9
6.5
3.5
9.5
2
91
19.2–38.9
28.8
7.0
2.7
9.0
3
91
39.6–77.1
50.4
5.0
3.0
7.0
4
91
77.2–2491.6
119.5
6.0
6.0
6.0
366
1
92
7.5–38.8
26.7
6.0
3.0
8.0
2
91
39.7–63.7
50.8
7.0
2.3
11.0
3
92
63.7–107.6
81.0
6.0
5.5
8.0
4
91
109.5–710.1
161.1
4.5
3.5
5.0
301
1
82
0.2–1.4
0.8
5.0
3.0
7.0
2
81
1.4–2.8
2.0
7.0
5.0
12.0
3
82
2.8–4.4
3.4
6.0
3.5
7.0
4
81
4.4–11.4
5.7
6.0
4.0
8.0
317
1
86
0.1–0.9
0.5
3.0
2.7
6.0
2
86
0.9–1.9
1.4
7.5
4.0
11.0
3
86
1.9–2.8
2.3
6.0
5.0
6.5
4
85
2.9–7.9
3.8
7.0
4.0
9.0
334
1
91
0.02–2.0
1.2
5.0
3.0
7.0
2
90
2.0–3.7
2.8
5.5
5.0
6.0
3
91
3.7–5.3
4.4
6.0
3.5
6.5
4
90
5.4–12.4
7.2
7.0
5.5
7.0
342
1
86
0.1–2.5
1.9
5.0
3.0
10.5
2
85
2.5–3.5
3.0
7.0
3.5
7.5
3
86
3.5–4.8
4.1
6.0
6.0
9.0
4
85
4.8–25.1
6.5
5.0
3.0
6.0
334
1
84
0.2–1.6
1.3
7.0
3.0
12.0
2
83
1.6–2.4
1.9
5.0
3.0
8.0
3
84
2.4–3.6
2.8
7.0
4.0
9.0
4
83
3.6–30.9
5.2
5.0
5.5
4.5
348
1
87
0.3–3.6
2.9
7.0
3.5
11.0
2
87
3.6–5.2
4.3
6.0
5.0
8.0
3
87
5.2–8.0
6.2
5.0
4.0
6.0
4
87
8.0–95.7
11.6
6.0
5.5
6.0
284
1
71
0.3–0.9
0.7
6.0
5.0
8.5
2
71
0.9–1.4
1.1
7.0
3.0
9.0
3
71
1.4–2.3
1.6
5.8
5.0
6.0
4
71
2.3–30.0
3.3
4.5
4.5
4.5
serum drawn at approximately 26 weeks gestation, values below the limit of detection (LOD) were assigned the value of LOD/2; category; estrogenic category; category; androgenic category. Abbreviations: Persistent organic pollutant (POP), sample size (N), sample size of subset (n), dichlorodiphenyldichloroethylene (DDE), dichlorodiphenyltrichloroethane (DDT), hexachlorocyclohexane (HCCH), hexachlorobenzene (HCB), polychlorinated biphenyl (PCB).
