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. 2016 Apr 18;19(14):2572–2579. doi: 10.1017/S1368980016000756

Table 1.

Demographic characteristics of the study participants by BMI category: pregnant women (n 869) recruited between 12 and 20 weeks of gestation, Ottawa and Kingston (OaK) Birth Cohort study, April 2008–April 2009

BMI (kg/m2)
Overall <25·0 25·0–29·9 ≥30·0 P §
BMI (kg/m2) 869 100·0 446 51·3 226 26·0 197 22·7
Age (years)
≤29 420 48·3 223 50·0 107 47·3 90 45·7 0·181
30–34 293 33·7 145 32·5 70 31·0 78 39·6
≥35 156 18·0 78 17·5 49 21·7 29 14·7
GA at recruitment (week)
12 584 67·2 308 69·1 158 69·9 118 59·9 0·048
13–15 239 27·5 113 25·3 55 24·3 71 36·0
16–20 46 5·3 25 5·6 13 5·8 8 4·1
Maternal education
High school and below 170 19·6 91 20·4 34 15·0 45 22·8 0·010
College/university not completed 77 8·8 31 6·9 19 8·4 27 13·7
College/university completed 622 71·6 324 72·7 173 76·6 125 63·5
Race
Caucasian 796 91·6 400 89·7 211 93·4 185 93·9 0·111
Other races 73 8·4 46 10·3 15 6·6 12 6·1
Household annual income ($CAN)
Declined 46 5·3 31 6·9 6 2·6 9 4·6 0·005
≤49 999 244 28·1 128 28·7 54 23·9 62 31·5
50 000–79 999 274 31·5 123 27·6 77 34·1 74 37·5
≥80 000 305 35·1 164 36·8 89 39·4 52 26·4
Smoking
No 734 84·5 367 82·3 200 88·5 167 84·8 0·110
Yes 135 15·5 79 17·7 26 11·5 30 15·2
Folic acid supplement||
Non-users 35 4·0 10 2·2 9 4·0 16 8·1 0·009
≤1 mg/d 710 81·7 377 84·6 183 81·0 150 76·1
>1 mg/d 124 14·3 59 13·2 34 15·0 31 15·8
MTHFR 677C→T genotype
CC 371 42·7 181 40·6 90 39·8 100 50·8 0·036
CT 394 45·3 212 47·5 112 49·6 70 35·5
TT 104 12·0 53 11·9 24 10·6 27 13·7

GA, gestational age; MTHFR, methylenetetrahyrofolate reductase gene.

Data are presented as n and %. BMI = [weight (kg)]/[height (m)]2. BMI was measured in pregnancy (between 12 and 20 weeks of gestation); this may lead to misclassification of BMI category.

§

P value of χ 2 test.

||

Folic acid from supplements, not including folic acid from fortified foods or naturally occurring food folate.