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Table 4 Results of Cox proportional hazard models

From: Using medication utilization information to develop an asthma severity classification model

  Model 1 (4 groups) Model 2 (3 groups) Model 3 (2 groups)
HR(95%CI) p-value HR(95%CI) p-value HR(95%CI) p-value
Asthma severity
Stage 1 Reference   Reference   Reference  
Stage 2 1.389(0.741–2.603) 0.3053
Stage 3 1.597(1.133–2.252) 0.0075 1.547(1.105–2.165) 0.0109 1.634(1.211–2.203) 0.0013
Stage 4 1.916(1.220–3.010) 0.0047 1.857(1.189–2.900) 0.0065
  1. HR hazard ratio, CI confidence interval
  2. After adjusted for age, gender, Charlson Comorbidity Index, obesity, Sinusitis, and Gastroesophageal reflux disease