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Table 4 Multiple logistic regression analysis of odds ratios (OR) for participation in the IDEFICS study versus belonging to the reference population

From: Assessment of selection bias in a health survey of children and families – the IDEFICS Sweden-study

   Univariate   Multivariate
Coefficients OR (95% CI) p-value OR (95% CI ) p-value
Family typea 2.04 (1.61-2.57) <0.001 1.75 (1.38-2.23) <0.001
Number of children in the familyb 1.40 (1.14-1.72) 0.001    
Parental originc 2.01 (1.56-2.58) <0.001 1.91 (1.48-2.47) <0.001
Highest attained education Medium vs Lowd 1.63 (0.94-2.83) 0.966 1.19 (0.68-2.09) 0.436
Highest attained education High vs Lowd 2.63 (1.52-4.54) <0.001 1.80 (1.02-3.16) 0.001
Disposable income/family (100.000 SEK)e 1.06 (1.02-1.09) 0.001    
Unemployment compensation/familyf 1.41 (1.13-1.75) 0.003    
Disability pension/familyf 1.84 (1.29-2.63) 0.001    
Social welfare pension/familyf 2.64 (1.69-4.12) <0.001    
Financial study assistance/familyf 1.49 (1.16-1.90) 0.002    
Child BMI SDS index 0.96 (0.91-1.02) 0.219    
  1. The dependent variable is the odds of family characteristics in the IDEFICS population vs. the reference population (0 = reference population).
  2. a Reference category = Single parent.
  3. b Reference category = 1 child (1 vs. 2 or more children).
  4. c Reference category = Non-Swedish.
  5. d The ISCED educational levels are low 1–2, medium 3–4, and high 5–6.
  6. e SEK= the currency of Sweden, the Swedish krona.
  7. f Reference category = yes.