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Table 4 Clinical outcomes of total cohort, excluded patients by ICC classification, and Group NW by WIND classification

From: Validation of a new WIND classification compared to ICC classification for weaning outcome

Variables Total
(n = 1600)
ICC WIND
Excluded
(n = 865)
Group NW
(n = 580)
Interval between intubation and the first SA, daysa 3 (2–6) 4 (2–10)
SOFA score at the day of first SAa 5 (3–8) 7 (5–9)
MV days 5 (2–11) 6 (2–15) 5 (2–11)
Ventilator-free daysb 2 (0–24) 0 (0–0) 0
Tracheostomy 436 (27.3) 277 (32.0) 101 (17.4)
 No 1164 (72.8) 568 (65.7) 479 (82.6)
 Before MV 20 (1.3) 20 (2.3) 6 (1.0)
 Between MV and first SA 219 (13.7) 219 (25.3) 95 (16.4)
 Between first SA and extubation 151 (9.4) 54 (6.2)
 After the first extubation 46 (2.9) 4 (0.5)
Interval between intubation and tracheostomy, daysc 11 (6–15) 9 (5–14) 10 (7–14)
Successful weaning from MVd 824 (51.5) 160 (18.5) 0
ICU mortality 656 (41.0) 588 (68.0) 511 (88.1)
LOS in ICU, days 7 (4–15) 8 (3–17) 6 (2–13)
Hospital mortality 848 (53.0) 643 (74.3) 520 (89.7)
LOS in hospital, days 24 (13–46) 20 (9–43) 15 (5–30)
Type of discharge    
 Home 422 (26.4) 44 (5.1) 0
 Other hospital 219 (13.7) 90 (10.4) 5 (0.9)
 Other ICU 24 (1.5) 20 (2.3) 10 (1.7)
 Hospice 87 (5.4) 68 (7.9) 45 (7.8)
 Death 848 (53.0) 643 (74.3) 520 (89.7)
  1. ICC International Consensus Conference, NW no weaning, WIND Weaning according to a New Definition, SA separation attempt, SOFA Sequential Organ Failure Assessment, MV mechanical ventilation, ICU intensive care unit, LOS length of stay
  2. aExcluded patients who had no SA from MV. Therefore, total patients, excluded patients by ICC, and Group NW by WIND numbered 1020, 285, and 0, respectively
  3. bVentilator-free days are defined as 28 minus the total number of days with invasive MV. Nonsurvivors were considered as having 0 ventilator-free days
  4. cExcluded patients with no tracheostomy or tracheostomy prior to mechanical ventilation
  5. dSuccessful weaning is defined as in the WIND Study (Intubated patients: extubation without death or reintubation within 7 days after extubation [whether postextubation noninvasive ventilation was used or not] or ICU discharge without invasive mechanical ventilation within 7 days, whichever comes first. Tracheostomized patients: spontaneous ventilation through tracheostomy without any mechanical ventilation during 7 consecutive days or ICU discharge with spontaneous breathing, whichever comes first)
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