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Table 4 Study outcomes

From: Clinical variables predicting the risk of a hospital stay for longer than 7 days in patients with severe acute exacerbations of chronic obstructive pulmonary disease: a prospective study

Variables Normal LHS (≤ 7 days) (n = 213) Prolonged LHS (>  7 days) (n = 224) p value
NIMV, % 11 31 < 0.001
IMV, % 0 7 < 0.001
ICU admission, % 5 19 < 0.001
Mortality at 6-months, % 4 14 < 0.001
 Survival time 176.3 [173.8 to 178.8] 168.5 [164.3 to 172.7] 0.001
Cumulative mortality at 1-year, % 11 25 < 0.001
 Survival time 342.5 [334.4 to 350.5] 313.6 [301.1 to 326.2] < 0.001
Cumulative mortality at 3-years, % 37 48 0.036
 Survival time 904.6 [862.3 to 946.8] 783.8 [730.6 to 837.1] 0.007
  1. Data are shown as number of patients (percentage) and calculated for non-missing data
  2. Survival time was calculated as mean [95% confidence interval] and reported as days
  3. Abbreviations: NIMV and IMV indicate non-invasive and invasive mechanical ventilation, respectively; ICU, intensive care unit