Maternal exposure to metals and persistent pollutants and cord blood immune system biomarkers

Table 2 Study participant characteristics, MIREC Study, Canada, 2008–2011 (n = 1256)^a

Characteristic	N	%
Maternal Demographic
Maternal Age (yrs.)
≤24	60	4.8
25–29	270	21.5
30–34	450	35.8
≥35	476	37.9
Household Income ($CAD)
≤30,000	90	7.5
30,001-50,000	116	9.6
50,001-100,000	514	42.6
>100,000	487	40.4
Parental Smoking ^b
No	1006	80.1
Yes	250	19.9
Pet Ownership
No	559	44.5
Yes	697	55.5
Maternal Reproductive & Medical History
Pre-Pregnancy BMI^c
Underweight (<18.5)	27	2.3
Normal (18.5 to 24.9)	717	60.5
Overweight (25 to 29.9)	272	22.9
Obese (≥30)	170	14.3
Maternal Allergy^d
No	1202	95.7
Yes	54	4.3
Parity
Nulliparous	526	41.9
Primiparous	512	40.8
Multiparous	216	17.2
Multiparous	2	17.2
Infant Characteristics
Infant Sex
Male	671	53.5
Female	584	46.5
Birth Weight (g)
<2500	11	0.9
2500- < 3500	606	48.2
3500- < 4000	448	35.7
≥4000	192	15.3

^aSubtotals may not sum to total due to missing data, ^bdefined as either the mother or father smoking during pregnancy, ^cWorld Health Organization Classification [66], ^dDefined as maternal use of allergy medication

ISSN: 1476-069X