Relative risk of failure judged at enrolment compared with a patient with a pH of 7.35 and Paco 2 6 kPa treated without NIV
| pH | Treatment | Paco2 | |||
|---|---|---|---|---|---|
| 6 kPa | 8 kPa | 10 kPa | 12 kPa | ||
| 7.35 | Standard | 1.00 | 1.30 | 1.69 | 2.19 |
| + NIV | 0.39 | 0.51 | 0.66 | 0.86 | |
| 7.30 | Standard | 2.96 | 3.84 | 5.00 | 6.49 |
| + NIV | 1.15 | 1.50 | 1.95 | 2.53 | |
| 7.25 | Standard | 9.98 | 12.97 | 16.85 | 21.90 |
| + NIV | 3.89 | 5.06 | 6.57 | 8.54 | |