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Table 1 Participant characteristics

From: The role of maternal homocysteine concentration in placenta-mediated complications: findings from the Ottawa and Kingston birth cohort

Variable

Frequency

n = 7587

Age

 Mean (SD)

30.3 (5.06)

Race a (missing/unknown N = 415, 5.5%)

 African

152

(2.12%)

 Middle eastern

224

(3.12%)

 Asian

422

(5.88%)

 Caucasian

6250

(87.1%)

 Other

124

(1.73%)

BMI (missing N = 136, 1.8%)

 Mean (SD)

24.9 (5.5)

 Range

14.7–61.3

Participant education (missing N = 7, 0.09%)

 Grade school

153

(2.02%)

 High school

962

(12.7%)

 College/University not completed

754

(10.0%)

 College/University completed

5711

(75.3%)

Paternal/partner education (missing N = 95, 1.25%)

 Grade school

137

(1.83%)

 High school

1519

(20.3%)

 College/University not completed

590

(7.88%)

 College/University completed

5246

(70.0%)

Household income (missing N = 485, 6.4%)

  < 25 k

415

(5.84%)

 25 k - < 50 k

1188

(16.7%)

 50 k - < 80 k

2077

(29.2%)

  > =80 k

3422

(48.2%)

MTHFR genotype b

 CC (wild type)

1768

(44.1%)

 CT (heterozygous)

1760

(43.9%)

 TT (mutant)

478

(11.9%)

  1. aRace was categorized similar to the U.S. Census, in which the categories are: White, Black or African American, American Indian or Alaska Native, Asian (Far-east and Indian subcontinent), and Hawaiian or Pacific Islander. Participants whose response suggested a Central/South American, Latino, Hispanic, or Aboriginal background were classified into the ‘Other’ category. This follows the U.S. Census Bureau’s classification that: “People who identify their origin as Hispanic, Latino, or Spanish may be of any race” [51]
  2. bMeasured in a subset of participants (n = 4006)