Skip to main content

Table 1 Baseline socio-demographic and lifestyle characteristics of the participants in the study according to their pre-pregnancy body mass index (BMI)

From: Pre-pregnancy Body Mass Index (BMI) and delivery outcomes in a Canadian population

Characteristic

Full sample (N) 1

Normal weight (BMI 18.5-24.9 kg/m 2)

Overweight (BMI 25–29.9 kg/m 2)

p*

Obese (BMI ≥ 30 kg/m 2)

p †

N (%)

1996 (100%)

1313 (65.8%)

472 (23.6%)

 

211 (10.6)

 

Demographics

Maternal age

   

0.279

 

0.261

  ≤34 years old

1539 (78.3)

1011 (78.5)

356 (76.1)

 

172 (81.9)

 

  ≥35 years old

427 (21.7)

277 (21.5)

112 (23.9)

 

38 (18.1)

 

Ethnicity

   

0.025

 

0.005

  Caucasian

1602 (80.4)

1027 (78.4)

392 (83.2)

 

183 (86.7)

 

  Other

390 (19.6)

283 (21.6)

79 (16.8)

 

28 (13.3)

 

Household income

   

0.451

 

0.035

  ≤ $39,000

139 (7.2)

87 (6.8)

34 (7.4)

 

18 (8.7)

 

  $40,000- $79,999

394 (20.3)

243 (19.0)

98 (21.4)

 

53 (25.7)

 

  ≥ $80,000

1406 (72.5)

946 (74.1)

325 (71.1)

 

135 (65.5)

 

Education

   

<0.001

 

<0.001

  High school

190 (9.5)

108 (8.3)

47 (10.0)

 

35 (16.6)

 

  Post-secondary

1802 (90.5)

1201 (91.7)

425 (90.0)

 

176 (83.4)

 

Marital status

   

0.961

 

0.450

  Single

92 (4.6)

59 (4.5)

21 (4.4)

 

12 (5.6)

 

  Married/common law

1901 (95.4)

1251 (95.5)

451 (95.6)

 

199 (94.3)

 

Lifestyle

Smoking during pregnancy

   

0.416

 

0.033

  No

1894 (94.9)

1248 (95.0)

453 (96.0)

 

193 (91.5)

 

  Yes

102 (5.1)

65 (5.0)

19 (4.0)

 

18 (8.5)

 

Alcohol use in pregnancy2

   

0.018

 

0.288

  No

1981 (99.2)

1306 (99.5)

464 (98.3)

 

211 (100.0)

 

  Yes

15 (0.8)

7 (0.5)

8 (1.7)

 

0 (0.0)

 

Recreational drugs use in pregnancy

   

0.285

 

0.571

  No

1992 (99.8)

1311 (99.8)

470 (99.6)

 

211 (100.0)

 

  Yes

4 (0.2)

2 (0.2)

2 (0.4)

 

0 (0.0)

 
  1. Data presented as n (%) (χ2 test) for categorical variables or mean (95% confidence intervals) (analysis of variance ANOVA) for continuous variables.
  2. *Comparison between normal weight and overweight women.
  3. †Comparison between normal weight and obese women.
  4. 1May not add to total number (N = 1996) due to missing.
  5. 2Refers to consumption of ≥3 drinks on any one occasion at any time during pregnancy.
  6. Omnibus test p-values were significant for ethnicity (p = 0.004), education (p = 0.001), smoking (p = 0.043), and alcohol use in pregnancy (p = 0.018) and not significant for any of the other variables included in the table.
  7. Percentages are calculated per column for each variable.
  8. BMI, body mass index.