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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.