Is there evidence of non linearity for age or for height? There was some previous literature that

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Is there evidence of non linearity for age or for height? 


There was some previous literature that the effect of age and height on FEV might not be linear. Hence, we ran the regression model in Table 11.35.

Table 11.35 Quadratic regression of FEV on age, height, gender, and smoking

 Regression Analysis: FEV vs. Age, Hgt,. The regression equation is FEV = - 4.84 + 0.0633 Age + 0.110 Hgt + 0.0952 Sex +

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