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Table 3 Sociodemographic characteristics of the APrON & AOB cohorts compared to the MES provincial and national samples

From: Comparison of sample characteristics in two pregnancy cohorts: community-based versus population-based recruitment methods

Characteristic

APrON

AOB-OC

AOB-PC

MES Alberta (n=651)

MES Canada (n=6,421)

Calgary cohort comparisons

p-value**

Age

n=1,200

n=916

n=1,455

  

Overall Chi2

0.196

     15–19

0.4 (0.05-0.78)

0.5 (0.07-1.02)

0.4 (0.08-0.74)

3.8 (3.3–4.3)

3.0 (2.8–3.2)

AOB-OC vs. APrON

0.198

     20–24

4.5 (3.3-5.7)

5.4 (4.0-6.9)

6.2 (4.9-7.4)

15.2 (12.8–17.6)

13.0 (12.3–13.8)

AOB-PC vs. APrON

0.507

     25–29

27.1 (24.6-29.6)

30.5 (27.5-33.4)

26.5 (24.2-28.7)

34.1 (31.6–36.6)

33.1 (32.2–33.9)

AOB-OC vs. AOB-PC

0.095

     30–34

44.6 (41.8-47.4)

41.7 (38.5-44.9)

42.9 (40.3-45.4)

30.6 (28.2–32.9)

32.9 (32.0–33.8)

  

     35–39

19.9 (17.6-22.2)

19.7 (17.1-22.2

20.1 (18.1-22.2)

13.0 (10.8–15.3)

14.5 (13.7–15.3)

  

     ≥40

3.5 (2.5-4.5)

2.2 (1.2-3.1)

3.9 (2.9-4.9)

2.6 (1.4–3.7)

3.0 (2.5–3.4)

  

Education

n=1,154

n=1,117

n=1,875

  

Overall Chi2

<0.001

     Less than high school

1.5 (0.8-2.2)

3.3 (2.3-4.4)

3.1 (2.3-3.9)

7.3 (5.6–9.1)

7.6 (6.9–8.2)

AOB-OC vs. APrON

<0.001

     High school graduate

8.2 (6.6-9.8)

18.1 (15.8-20.3)

22.8 (20.9-24.7)

22.8 (19.7–25.9)

19.2 (18.2–20.1)

AOB-PC vs. APrON

<0.001

     Postsecondary education

90.3 (88.6-92.0)

78.6 (76.2-81.0)

74.1 (72.1-76.1)

69.5***

72.1***

AOB-OC vs. AOB-PC

0.009

Income

n=1,147

n=1,083

n=1,820

  

Overall Chi2

0.008

     At or below the LICO✝

5.9 (4.6-7.3)

9.2 (7.5-11.0)

8.6 (7.3-9.9)

13.4 (10.9-15.8)

18.4 (17.4–19.4)

AOB-OC vs. APrON

0.003

     Above the LICO✝✝

94.1 (92.7-95.4)

90.8 (89.0-92.5)

91.4 (90.1-92.7)

77.8 (74.7-80.8)

72.6 (71.5–73.7)

AOB-PC vs. APrON

0.008

      

AOB-OC vs. AOB-PC

0.543

Parity

n=1,177

n=1,112

n=1,866

  

Overall Chi2

<0.001

     Primiparous

56.8 (53.9-59.6)

54.9 (51.9-57.8)

46.5 (44.2-48.7)

46.0 (42.4–49.7)

44.7 (44.0–45.5)

AOB-OC vs. APrON

0.361

     Multiparous

43.2 (40.4-46.1)

45.1 (42.2-48.1)

53.5 (51.3-55.8)

53.8 (50.2–57.4)

54.9 (54.1–55.6)

AOB-PC vs. APrON

<0.001

      

AOB-OC vs. AOB-PC

<0.001

BMI (mean (95% CI))

n=1171

n=1,094

n=1,838

  

Overall F stat

<0.001

     Pre-pregnancy

24.9 (24.6 - 25.2)

23.7 (23.4-23.9)

24.7 (24.5-25.0)

24.4 (24.0–24.8)

24.4 (24.3–24.6)

AOB-OC vs. APrON

0.005

      

AOB-PC vs. APrON

0.011

      

AOB-OC vs. AOB-PC

<0.001

      

Overall F stat

<0.001

     Postpartum

n = 935

n=1008

n=1632

  

AOB-OC vs. APrON

0.001

 

25.6 (25.3 - 25.9)

24.9 (24.7-25.2)

26.0 (25.7-26.3)

25.5 (25.1–25.9)

25.4 (25.2–25.5)

AOB-PC vs. APrON

0.106

      

AOB-OC vs. AOB-PC

<0.001

Marital status

n=1,158

n=1,115

n=1,876

  

Overall Chi2

0.010

     Married/common law

96.3 (95.2-97.4)

93.5 (92.1-95.0)

95.2 (94.2-96.2)

Not available

Not available

AOB-OC vs. APrON

0.003

     Single/divorced/separated

3.7 (2.6-4.8)

6.5 (5.0-7.9)

4.8 (3.8-5.8)

  

AOB-PC vs. APrON

0.156

      

AOB-OC vs. AOB-PC

0.052

Born in Canada

n=1,152

n=1,118

n=1,878

  

Overall Chi2

0.007

     Yes

81.3 (79.1-83.6)

76.1 (73.6-78.6)

79.7 (77.8-81.5)

Not available

Not available

AOB-OC vs. APrON

0.002

     No

18.7 (16.4-20.9)

23.9 (21.4-26.4)

20.3 (18.5-22.2)

  

AOB-PC vs. APrON

0.260

      

AOB-OC vs. AOB-PC

0.023

Ethnicity

n=1,143

n=1,114

n=1,876

  

Overall Chi2

<0.001

     Caucasian

86.4 (84.4-88.3)

75.1 (72.6-77.7)

81.3 (79.6-83.1)

Not available

Not available

AOB-OC vs. APrON

<0.001

     Non-Caucasian

13.6 (11.7-15.7)

24.9 (22.3-27.4)

18.7 (16.9-20.4)

  

AOB-PC vs. APrON

<0.001

      

AOB-OC vs. AOB-PC

<0.001

  1. Note: Except for BMI, all values are percentages and 95% CI.
  2. **p-values derived from Chi2 tests for categorical variables and ANOVA/independent t-tests (F stat) for BMI. The overall Chi2 p-value compared the three cohorts within each characteristic variable; we set the p-value = 0.01 for statistical significance to account for multiple comparisons.
  3. ***Education categories did not match across the cohorts, including MES. Education categories were therefore collapsed to facilitate comparisons; thus some MES stats for collapsed categories do not contain confidence intervals.
  4. ✝Low income cut-off (LICO) MES category which corresponds to APrON and AOB category of < $40,000.
  5. ✝✝Low income cut-off (LICO) MES category which corresponds to APrON and AOB category of ≥ $40,000.