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Table 3 The mediating role of diet and physical activity on the relationship between SEP and BMI using the product of coefficients mediation method in the MCCS ^ study population

From: The mediating role of dietary factors and leisure time physical activity on socioeconomic inequalities in body mass index among Australian adults

  Association between education* and mediator Association between mediator and BMI† Mediated effect Proportion mediated
 a 95% CI  b 95% CI  ab 95% CI %
LTPA# M  0.69 (0.55, 0.83) −0.10 (−0.12, -0.09) −0.07 (−0.09, -0.05) 8%
W  0.70 (0.59, 0.80) −0.15 (−0.17, -0.13) −0.10 (−0.12, -0.09) 10%
Alcohol M  0.35 (−0.58, 1.31)  0.00 (0.00, 0.01)    
W  3.50 (3.11, 3.89) −0.03 (−0.03, -0.02) −0.10 (−0.13, -0.08) 10%
Diet soft drink M −0.23 (−0.37, -0.09)  0.16 (0.13, 0.18) −0.04 (−0.06, -0.01) 4%
W −0.41 (−0.52, -0.30)  0.20 (0.18, 0.23) −0.08 (−0.11, -0.06) 8%
Soft drink M −0.68 (−0.84, -0.52)  0.06 (0.04, 0.08) −0.04 (−0.06, -0.03) 5%
W −0.33 (−0.42, -0.25)  0.05 (0.02, 0.08) −0.02 (−0.03, -0.01) 2%
Healthy snacks M  0.14 (0.13, 0.16) −0.01 (−0.15, 0.13)    
W  0.11 (0.10, 0.12) −0.27 (−0.46, -0.09) −0.03 (−0.05, -0.01) 3%
Healthy savoury M  1.90 (1.54, 2.25) −0.02 (−0.03, -0.01) −0.04 (−0.06, -0.03) 4%
W  2.42 (2.14, 2.71) −0.01 (−0.02, 0.00) −0.03 (−0.05, -0.01) 3%
Fruit and vegetables M  0.07 (0.06, 0.09) −0.12 (−0.27, 0.03)    
W  0.09 (0.07, 0.10)  0.12 (−0.02, 0.25)    
Sweet snacks M −0.68 (−1.08, -0.29) −0.03 (−0.03, -0.02)  0.02 (0.01, 0.03) −2%
W −1.16 (−1.46, -0.86) −0.01 (−0.02, 0.00)  0.01 (0.00, 0.02) −1%
Unhealthy savoury M −2.66 (−3.04, -2.27)  0.03 (0.02, 0.04) −0.07 (−0.10, -0.05) 8%
W −2.26 (−2.5, -2.02)  0.06 (0.05, 0.07) −0.14 (−0.16, -0.11) 13%
Total mediated effect M      −0.24 (−0.29, -0.20) 27%
W      −0.49 (−0.54, -0.44) 48%
  1. Note: The total mediated effect and proportion mediated was calculated only for those variables which were significantly related to education (a) or BMI (b). Boldface is used to denote significant relationships. * Lowest educational attainment is the reference category.
  2. † Where zero consumption or not meeting guidelines is the reference category.
  3. # Leisure time physical activity (times/week).
  4. ^ This study utilises a sample of 30,630 participants from the baseline sample of the Melbourne Collaborative Cohort Study (MCCS) which was conducted in Melbourne between 1990 and 1994.