## 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) |

AGE^{a} |
1.09 | 1.09 |

(1.07–1.10) | (1.07–1.10) | |

AGE_SQ^{a} |
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 R^{2} |
0.08 | 0.08 |

^{a}Age 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