Research Article
Application of Cox Proportional Hazards Model in Case of Tuberculosis Patients in Selected Addis Ababa Health Centres, Ethiopia
Table 8
Result of test of proportionality assumption containing the variables in Table
7 and their interaction with log time.
(a) |
| Analysis of maximum likelihood estimates | Covariates | DF | Parameter estimate | Standard error | Chi-Square | Pr > ChiSq | Hazard ratio |
| Age | 1 | 0.01919 | 0.02212 | 0.7526 | 0.3857 | 1.019 | TBC | 1 | 0.20274 | 0.95433 | 0.0451 | 0.8318 | 1.225 | HIV | 1 | 1.09680 | 1.13372 | 0.9359 | 0.3333 | 2.995 | AgHIV | 1 | −0.02914 | 0.01722 | 2.8638 | 0.0906 | 0.971 | Age * log (time) | 1 | 0.00223 | 0.00561 | 0.6904 | 0.6904 | 1.002 | TBC * log (time) | 1 | −0.19525 | 0.23829 | 0.6714 | 0.4126 | 0.823 | HIV * log (time) | 1 | 0.31882 | 0.27050 | 1.3891 | 0.2385 | 1.375 | agHIV * log (time) | 1 | −0.0001785 | 0.0001725 | 1.0712 | 0.3007 | 1.000 |
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(b) |
| Linear hypotheses testing results | Label | Wald Chi-Square | DF | Pr > ChiSq |
| Test proportionality | 2.1579 | 4 | 0.7067 |
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