
Beta Coefficient

Odds Ratio

Odds Ratio 95% Confidence Interval

pvalue


Intercept

7.27

**
 
<0.0001

MCH (pg/cell)

0.19

0.83

0.77, 0.89

<0.0001

Change in MCH (per pg/cell)*

0.22

0.81

0.74, 0.88

<0.0001

CD4 (per 100 cells/mm^{3})

0.32

0.73

0.65, 0.81

<0.0001

Change in Percent CD4 (per percent)*

0.05

0.95

0.91, 0.99

0.008

 * Change is relative to the preHAART value for an individual, thus a positive value for change in MCH indicates an increase in MCH for an individual from their preHAART value.
 ** The intercept has no OR interpretation.
 *** To determine the predicted probability of having an HIV RNA > 500 copies/ml for an individual, take the value of each variable and multiply it by the corresponding Beta Coefficient. Take the sum of the resulting values and add the Intercept Beta Coefficient. This is the log(odds) that an individual has an HIV RNA value above 500 copies/ml. The predicted probability is then 1/(1+e(log(odds)).