Table 3

Parsimonious analysis for factors associated with hospital stay at index admission

VariableRR 95% CIP value
Age, per 5 years1.01 (0.997 to 1.03)0.126
Pre-FEV10.97 (0.95 to 1.00)0.055
VTE1.40 (1.09 to 1.78)0.007*
Hypoxic-hypercarbic encephalopathy1.53 (1.07 to 2.18)0.020*
Respiratory infection1.11 (1.01 to 1.23)0.040*
Osteoporosis1.42 (1.05 to 1.91)0.021*
Emergency admission1.06 (0.98 to 1.14)0.147
  • *P<0.05.

  • Pre-FEV1, Pre-bronchodilator forced expiratory volume in one second.; VTE, venous thromboembolism.