Interaction model for CHD at 10 years (1969)

Interaction model for CHD at 10 years (1969)

The interactive effect of Type A/B classification (EV1) and overweight/normal weight classification (EV2) on CHD 10 years later (RV) was tested because you were interested in determining if the association between Type A personality and CHD 10 years later differed between overweight and normal weight individuals.  So Type A personality is the main EV.

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Logistic regression                               Number of obs   =       3142

                                                  LR chi2(7)      =     152.70

                                                  Prob > chi2     =     0.0000

Log likelihood = -813.25227                       Pseudo R2       =     0.0858

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        chd69 |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]

————–+—————————————————————-

        typea |    .552525   .1925011     2.87   0.004     .1752254     .929825

          age |    .059724   .0118595     5.04   0.000     .0364799    .0829681

      chol240 |   .7373236   .1353085     5.45   0.000     .4721237    1.002523

       sbp140 |   .5543145   .1452926     3.82   0.000     .2695463    .8390826

overweighto~e |    .095618   .2381595     0.40   0.688    -.3711662    .5624021

        smoke |    .594825   .1387015     4.29   0.000     .3229751    .8666748

typea_by_over |   .4056084   .1988276     2.04   0.041     .0159063    .7953105

        _cons |  -6.531349   .5936486   -11.00   0.000    -7.694879   -5.367819

——————————————————————————-

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        chd69 | Odds Ratio   Std. Err.      z    P>|z|     [95% Conf. Interval]

————–+—————————————————————-

        typea |   1.737551   .3729809     2.87   0.004     1.191515    2.534066

          age |   1.061544   .0125893     5.04   0.000     1.037153    1.086507

      chol240 |   2.090333     .28284     5.45   0.000     1.603396     2.72515

       sbp140 |   1.740747   .2529176     3.82   0.000      1.30937    2.314243

overweighto~e |   1.100339   .2620561     0.40   0.688     .6899293    1.754883

        smoke |   1.812714    .251426     4.29   0.000     1.381231    2.378987

typea_by_over |   1.500215     .34537     2.04   0.041     1.016033     2.21513

        _cons |    .001457    .000865   -11.00   0.000     .0004552    .0046643

 Refer to the interaction model and interpret the test of Type A personality-by-BMI category interaction. If it is significant, it will be necessary for you to thoroughly describe how the size of the effect of Type A personality on CHD within 10 years is modified by BMI.  In your interpretation:

• report and interpret two ORs. The first OR should measure the association between Type A/B personality and getting CHD for the normal weight group.  And the second OR should measure the association between Type A/B personality and getting CHD for the overweight group (recall that one of these is already in the table, and the other has to be calculated from the relevant logistic regression coefficients in the output above)

-cite evidence from the STATA output indicating whether these 2 ORs differ significantly or do not differ significantly

Here is the coding of the relevant variables shown at the beginning of Part IV for your reference:

CHD: 0=absent, 1=present

Type A/B classification: 0=Type B, 1=Type A

BMI category: 0=normal weight, 1=overweight or obese