The probability values were:
for NIPPV tolerance, 0.49 (range: 0.40 - 0.80);
for staying mild, 0.66 (range: 0.60 - 0.70);
for staying moderate, 0.77 (range: 0.70 - 0.80);
for staying severe, 0.76 (range: 0.70 - 0.80); and
for staying terminal, 0.78 (range: 0.70 - 0.80).
The benefit in health-state utility associated with NIPPV compared with no NIPPV was 20%.
The following utility values were estimated:
mild, 0.8 (range: 0.7 - 0.9);
moderate, 0.6 (range: 0.5 - 0.7);
severe, 0.5 (range: 0.4 - 0.6);
terminal, 0.4 (range: 0.3 - 0.5).