Table 4

Parameter estimates of the alternative structural model specifications for the risk of being overweight/obese
Independent variables Instrumental variables odds ratios (95% CI) Logistic regression odds ratios (95% CI)
AGEa 1.09 1.09
(1.07–1.10) (1.07–1.10)
AGE_SQa 1.01 1.01
(1.00–1.00) (1.00–1.00)
EDUC 0.89 0.89
(0.87–0.91) (0.87–0.91)
MARRIED 1.11 1.14
(0.99-1.25) (1.01–1.28)
BMIYR 1.04 1.04
(1.03–1.06) (1.03–1.06)
SIBBMI 2.37 2.38
(2.23–2.53) (2.23–2.53)
RESWALK 0.90 1.00
(0.83–0.97) (0.96–1.04)
McFadden R2 0.08 0.08

aAge is centered before creating age squared so as to avoid any possible collinearity problems associated with entering both age and age squared as regressors.

Zick et al.

Zick et al. International Journal of Behavioral Nutrition and Physical Activity 2013 10:27   doi:10.1186/1479-5868-10-27

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