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Table 3 Stepwise multiple linear regression model on infant mortality rates across Italian regions

From: Socio-economic factors associated with infant mortality in Italy: an ecological study

  Step 1
  Coef. (95% CI) p-value
Gini coefficient 0.03 (−0.10, 0.16) 0.661
Mean household income −0.04 (−0.16, 0.09) 0.547
Unemployment rate 0.14 (−0.02, 0.30) 0.075
Proportion of women with ≥ 8 years of education 0.07 (−0.03, 0.16) 0.143
  Step 2
  Coef. (95% CI) p-value
Gini coefficient
Mean household income −0.04 (−0.15, –0.08) 0.519
Unemployment rate 0.16 (0.02, 0.29) 0.027
Proportion of women with ≥ 8 years of education 0.08 (−0.01, 0.16) 0.068
  Step 3
  Coef. (95% CI) p-value
Gini coefficient
Mean household income
Unemployment rate 0.19 (0.13, 0.26) <0.001
Proportion of women with ≥ 8 years of education 0.07 (−0.01, 0.14) 0.076
  Step 4
  Coef. (95% CI) p-value
Gini coefficient
Mean household income
Unemployment rate 0.15 (0.10, 0.20) <0.001
Proportion of women with ≥ 8 years of education
  1. Notes. Step 1: R2 = 0.76; F-test (p-value) = 12.01 (<0.001). Step 2: R2 = 0.76; F-test (p-value) = 16.78 (<0.001). Step 3: R2 = 0.75; F-test (p-value) = 25.81 (<0.001). Step 4: R2 = 0.68; F-test (p-value) = 42.05 (<0.001).