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Table 2 Logistic analysis of predictors for severely frequent exacerbations (Group 2B)

From: Predictors of exacerbation frequency in chronic obstructive pulmonary disease

  B Wald Sig. RR 95% CI for RR
Lower Upper
Comorbidity 1.340 5.453 0.020 3.818 1.240 11.752
NPPV 1.145 7.691 0.006 3.143 1.399 7.062
FEV1 -0.954 5.096 0.024 0.385 0.168 0.882
Exacerbations in the year preceding enrollment 0.861 13.881 0.000 2.366 1.504 3.722
  1. RR, relative risk; NPPV, non-invasive positive pressure ventilation; FEV1, forced expiratory volume in one second.