What is the estimated OR for hypertension comparing Hispanic vs. Caucasian boys with BMI = 25 kg/m²(call this OR₃.)? 

One assumption of the model in Table 13.55 is that the association between hypertension and ethnic group would be the same for all levels of BMI. To test this assumption a third logistic model was run as presented in Table 13.56.

Table 13.56 Possible effect modification of the association between hypertension and ethnic group by BMI among 27,009 boys in the Pediatric Task Force Data

 

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Variable Regression coefficient se Intercept African American 0.028 -2.169 0.044 0.063 Hispanic 0.231 0.066 BM-20* 0.123 0.006 African American -0.035 0.009 x (BMI-20) Hispanic x (BMI-20) -0.024 0.012 * BMI minus 20