Table 3

Results from the mediation analyses in the association between parental education and waist circumference (cm)
(n = 4636) Parental education effect on mediator (path a, X → M) Single mediator model Mediator effect on WC (path b, M → Y) Multiple mediator model Mediator effect on WC (path b, M → Y)
Total association (path c) (95% CI): -0.94 (−1.47 to −0.41)
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 −0.085 −0.504 to 0.335 0.693
Breakfast (days/week) 0.26 0.15 to 0.37 <0.001 −0.484 −0.622 to −0.346 <0.001 −0.444 −0.582 to −0.305 <0.001
Active transportation (min/week) −3.74 −7.09 to 0.39 0.029 −0.002 −0.006 to 0.003 0.489
Sports participation (hours/week) 0.50 0.34 to 0.67 <0.001 −0.231 −0.323 to −0.139 <0.001 −0.219 −0.311 to −0.128 <0.001
TV viewing (hours/week) −1.26 −1.69 to −0.83 <0.001 0.089 0.053 to 0.124 <0.001 0.068 0.029 to 0.107 0.001
Computer use (hours/week) −1.19 −1.61 to −0.78 <0.001 0.058 0.021 to 0.095 0.002 0.019 −0.021 to 0.059 0.342
Sleep duration (h/day) −0.04 −0.09 to 0.01 0.105 −0.676 −0.981 to −0.370 <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) 0.01 −0.05 to 0.07 −0.95 −1.48 to −0.42 0.001 -
Breakfast (days/week) −0.13 −0.20 to −0.06 −0.81 −1.34 to −0.28 0.003 13.5
Active transportation (min/week) 0.01 −0.01 to 0.04 −0.96 −1.49 to −0.43 0.001 -
Sports participation (hours/week) −0.12 −0.18 to −0.06 −0.96 −1.49 to −0.43 0.002 12.4
TV viewing (hours/week) −0.11 −0.19 to −0.06 −0.83 −0.36 to −0.30 0.002 11.9
Computer use (hours/week) −0.07 −0.14 to −0.03 −0.87 −1.40 to −0.34 0.001 7.4
Sleep duration (h/day) 0.03 −0.01 to 0.08 −0.97 −1.49 to −0.44 <0.001 -
All significant mediators −0.34 −0.46 to −0.23 −0.60 −1.13 to −0.07 0.026 35.8

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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