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Table 4 Direct (forced-entry) logistic regression analysis of best-fitting model for predictors of 6-month exclusive breastfeeding among a subsample of participants from the first cohort of Alberta Pregnancy Outcomes and Nutrition (APrON) study *,†

From: Predictors of exclusive breastfeeding: observations from the Alberta pregnancy outcomes and nutrition (APrON) study

Model, predictor β 1 SE 2 Wald p-value Exp (B) 3 95% CI 4
Model 1       
IIFAS score 0.08 0.03 9.76 0.002 1.08 1.03-1.14
Constant -6.96 1.75 15.86 0.000 0.001
Model 2       
IIFAS score 0.07 0.03 8.78 0.003 1.08 1.03-1.13
Multiparity 0.63 0.35 3.30 0.070 1.88 0.95-3.73
Constant -7.01 1.75 15.96 0.000 0.001
Model 3       
IIFAS score 0.07 0.03 7.82 0.005 1.08 1.02-1.13
Multiparity 0.77 0.36 4.54 0.033 2.16 1.06-4.39
Completed university undergraduate degree 0.58 0.51 1.29 0.257 1.79 0.66-4.87
Completed university post-graduate degree 1.50 0.53 7.91 0.005 4.46 1.57-12.63
Constant -7.77 1.92 16.46 0.000 0.000
Model4 5       
IIFAS score 0.07 0.03 7.70 0.006 1.08 1.02-1.13
Multiparity 0.79 0.37 4.65 0.031 2.21 1.08-4.52
Completed university undergraduate degree 0.52 0.52 1.00 0.318 1.68 0.61-4.63
Completed university post-graduate degree 1.33 0.54 5.93 0.015 3.76 1.30-10.92
Pre-pregnancy BMI6 -0.05 0.05 1.30 0.255 0.95 0.87-1.04
Constant -6.52 2.30 8.05 0.005 0.001
  1. IIFAS: Iowa Infant Feeding Attitude Scale; BMI: body mass index.
  2. *Reference categories include: parity (primiparous); education (less than secondary education).
  3. IIFAS score and pre-pregnancy BMI were entered into models as continuous variables, while multiparity and maternal education were entered as categorical factors.
  4. 1Coefficient of regression.
  5. 2Standard error.
  6. 3Exponential value of β.
  7. 495% confidence interval of the exponential value.
  8. 5Nagelkerke R2 =0.16; Hosmer-Lemeshow test: (X2 = 13.31, p = 0.10); positive predictive value = 60.00%; negative predictive value = 84.67%.
  9. 6BMI was calculated by dividing the weight in kilograms by square of height in meters.