Table 2

Results from the mediation analyses in the association between parental education and BMI (kg/m2)
(n = 4636) Parental education effect on mediator (path a, X → M) Single mediator model Mediatior effect on BMI (path b, M → Y) Multiple mediator model Mediator effect on BMI (path b, M → Y)
Total association (path c) (95% CI): -0.43 (−0.64 to −0.23)
Mediator: Beta 95% CI p-value Beta 95% CI p-value Beta 95% CI p-value
Sugared drinks (l/day) −0.14 −0.18 to −0.11 <0.001 −0.186 −0.346 to −0.025 0.233 −0.279 −0.443 to −0.116 <0.001
Breakfast (days/week) 0.26 0.15 to 0.37 <0.001 −0.211 −0.264 to −0.158 <0.001 −0.200 −0.253 to −0.147 <0.001
Active transportation (min/week) −3.63 −6.99 to −0.28 0.034 0.001 −0.002 to 0.002 0.889
Sports participation (hours/week) 0.50 0.33 to 0.66 <0.001 −0.062 −0.097 to −0.027 <0.001 −0.055 −0.090 to −0.021 0.002
TV viewing (hours/week) −1.27 −1.67 to −0.81 <0.001 0.028 0.015 to 0.042 <0.001 0.024 0.009 to 0.038 0.002
Computer use (hours/week) −1.19 −1.60 to −0.77 <0.001 0.020 0.005 to 0.034 0.006 0.010 −0.005 to 0.025 0.205
Sleep duration (h/day) −0.04 −0.09 to 0.01 0.114 −0.309 −0.426 to −0.192 <0.001
All significant mediators
Indirect effect (a*b, X → M → Y) Direct effect (path c′, X → Yadj M) Percentage mediated (a*b/c)
Mediator: Beta 95% CI Beta 95% CI p-value %
Sugared drinks (l/day) 0.03 0.03 to 0.05 −0.46 −0.66 to −0.26 <0.001 −6.1
Breakfast (days/week) −0.05 −0.08 to −0.03 −0.38 −0.58 to −0.18 <0.001 12.6
Active transportation (min/week) 0.01 −0.01 to 0.01 −0.43 −0.64 to −0.23 <0.001 -
Sports participation (hours/week) −0.03 −0.05 to −0.02 −0.40 −0.61 to −0.20 <0.001 7.1
TV viewing (hours/week) −0.03 −0.06 to −0.02 −0.40 −0.60 to −0.20 <0.001 8.0
Computer use (hours/week) −0.02 −0.05 to −0.01 −0.41 −0.61 to −0.21 <0.001 5.4
Sleep duration (h/day) 0.01 −0.01 to 0.03 −0.45 −0.65 to −0.24 <0.001 -
All significant mediators −0.08 −0.13 to −0.03 −0.35 −0.56 to −0.23 0.001 18.7

For an explanation of a, b, c, c’, please see Figure  1.

All models were adjusted for age, gender and country.

Fernández-Alvira et al.

Fernández-Alvira et al. International Journal of Behavioral Nutrition and Physical Activity 2013 10:80   doi:10.1186/1479-5868-10-80

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