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Table 5 Multivariate Cox proportional hazards analysis of relationships between variables and exacerbation in ex-/non-smokers (n = 39)

From: Ambulatory pulse oximetry monitoring in Japanese COPD outpatients not receiving oxygen therapy

Variable Risk ratio 95% CI p
Age-adjusted Charlson Comorbidity Index 0.96 0.67 – 1.37 0.82
Body mass index 0.88 0.72 – 1.06 0.18
CAT score 1.08 0.99 – 1.18 0.10
%FEV1 0.99 0.95 – 1.02 0.45
Daytime proportion of SpO2 values < 90% 1.00 0.84 – 1.18 0.97
Nighttime proportion of SpO2 values < 90% 0.99 0.92 – 1.05 0.68
  1. CAT, Chronic obstructive pulmonary disease assessment test; CI, confidence interval; FEV1, forced expiratory volume in one second; SpO2, Oxygen saturation by pulse oximetry.