Table 1 Baseline characteristics of the study sample
Variable | Number and proportion (%) of study sample unless otherwise indicated |
|---|---|
Maternal age | Â |
 Years, mean (SD) | 29.9 (5.8) |
 < 35 years | 231 (77.0%) |
 ≥ 35 years | 69 (23.0%) |
Ethnicity | Â |
 Caucasian | 174 (58.0%) |
 Other | 64 (21.3%) |
 Blank | 59 (19.7%) |
 Not legible | 3 (1.0%) |
Marital status | Â |
 Married or common-law | 230 (76.7%) |
 Single | 36 (12.0%) |
 Blank | 33 (11.0%) |
 Unclear (not legible or discrepant documentation) | 1 (0.3%) |
Education | Â |
 Post-secondary | 156 (52.0%) |
 Secondary or less | 57 (19.0%) |
 Blank | 83 (27.7%) |
 Not legible | 4 (1.3%) |
Occupation | Â |
 Work outside the home | 180 (60.0%) |
 Homemaker | 50 (16.7%) |
 Student | 17 (5.7%) |
 Unemployed | 19 (6.3%) |
 Blank | 24 (8.0%) |
 Unclear (not legible or discrepant documentation) | 10 (3.3%) |
Currently smoking | 44 (14.7%) |
Pregnancy history | Â |
 First time giving birth | 86 (28.7%) |
 One or more previous births | 214 (71.3%) |
BMI classification | Â |
 Underweight (BMI ≤ 18.4 kg/m2) | 11 (3.7%) |
 Normal weight (BMI 18.5-24.9 kg/m2) | 126 (42.0%) |
 Overweight (BMI 25.0-29.9 kg/m2) or when height unavailable weight of 70–89 kg [17] (most pre-pregnancy) | 79 (26.3%) |
 Obese (BMI ≥ 30 kg/m2) or when height unavailable weight of ≥ 90 kg [13, 17, 18] (most pre-pregnancy) | 82 (27.3%) |
 No weight recorded anywhere on chart | 2 (0.7%) |