Table 1. Evaluation of the device’s ability to provide the required FIO2.
| A. | ||||||
| Desired FIO2 | 21% | 18% | 15% | 12% | 9% | 6% |
| Actual FIO2 (%) | 20.6 ± 0.1 | 17.5 ± 0.3 | 14.6 ± 0.2 | 11.8 ± 0.2 | 8.8 ± 0.2 | 5.9 ± 0.3 |
| B. | ||||||
| FIO2 to reach | 18 ± 1 % | 15 ± 1 % | 12 ± 1 % | 9 ± 1 % | 6 ± 1 % | |
| Time to reach the FIO2 | 4.08 ± 0.9 s* | 10.6 ± 0 s | 9.12 ± 1 s | 9.78 ± 0.9 s | 14.84 ± 4.2 s* |
A) Evaluation of actual inspiratory fraction of oxygen (FIO2) for the different FIO2 values tested. Values are expressed as mean ± SD.
B) Time necessary to reach a stable composition (± 1%) for the different FIO2 values tested.
ANOVA on ranks was used as the statistical test. Values are expressed as mean ± SD. p values were < 0.05;
*
Indicates significant difference (p<0.001) between the time to reach 18 ± 1 % and 6 ± 1%.