Table 3

Parameter estimates of the alternative bmi structural model specifications (t statistics in parentheses)
Independent variables Instrumental variables regression coefficients (t-statistics) Least squares regression coefficients (t-statistics)
INTERCEPT 27.96 28.21
(82.41)** (83.45)**
AGEa 0.22 0.22
(16.57)** (16.66)**
AGE_SQa −0.00 −0.01
(−2.71)** (−2.89)**
EDUC −0.31 −0.33
(−13.04)** (−13.88)**
MARRIED 0.33 0.38
(2.62)** (2.97)**
BMIYR 0.09 0.10
(7.54)** (8.11)**
SIBBMI 2.34 2.35
(35.82)** (35.75)**
RESWALK −0.24 −0.00
(−3.23)** (−0.08)
Adjusted R2 0.16 0.16
F Statistic 268.52** 267.90**

**p < .05.

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

Open Data