Table 6.

Description of household and mother’s characteristics by detection of TCE in breast milk

	Overall		Not Detected		Detected
Characteristics	n	%	n	%	n	%	p-value
Mother’s age
<21 years	4	20	1	8	3	43	0.17
21–25 years	8	40	7	54	2	14
>25 years	8	40	5	38	3	43
Mother’s education
some high school	2	10	2	15	0	0	0.56
completed high school	9	45	5	39	4	57
technical school	2	10	2	15	0	0
some college	7	35	4	31	3	43
Annual household income
0–19,000	7	50	4	50	3	50	0.63
20–39,000	5	36	2	25	3	50
40–59,000	2	14	2	25	0	0
Working status
Working, full or part-time	2	11	2	17	0	0	0.13
Looking for work or laid off	3	15	3	25	0	0
Going to school	2	10	0	0	2	29
Keeping house	12	60	7	58	5	71
Worked in maquiladora
Never	17	85	11	84	6	86	0.75
> 5 years ago	1	5	1	8	0	0
1–5 years ago	1	5	0	0	1	14
Within past year	1	5	1	8	0	0
Mother worked in electronics maquiladora
Yes	3	15	2	15	1	14	1.00
No	17	85	11	85	6	86
Mother worked with solvents in maquiladora
Yes	2	10	2	15	0	0	0.52
No	18	90	11	84	7	100
Household member works in maquiladora
Yes	2	10	1	8	1	14	1.00
No	18	90	12	92	6	86
Time at current residence
≤5 years	14	70	10	77	4	57	0.61
> 5 years	6	30	3	23	3	43
Residency during pregnancy
Yes	17	85	11	85	6	86	1.00
No	3	15	2	15	1	14
Lived outside of Ambos Nogales Region
Yes	9	45	8	62	1	14	0.07
No	11	55	5	39	6	86
Lived in Mexico
Yes	8	40	6	46	2	29	0.64
No	12	60	7	54	5	71
Mother’s shower frequency
< 1 per week	1	5	1	8	0	0	1.00
Everyday	19	95	12	92	7	100
Mother’s shower duration
5–15 minutes	11	55	5	38	6	86	0.07
16–30 minutes	9	45	8	62	1	14
Mother’s shower temperature
Hot	7	35	4	31	3	43	0.65
Warm	13	65	9	69	4	57