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Major outcomes.
| Index | Test group (N=20), mean (SD) | Control group (N=22), mean (SD) | P value |
| ISIa | 113.5 (0.8) | 93.2 (71.2) | .22 |
| SUSb | 79.25 (20.59) | 79.43 (18.83) | .94 |
aISI (incentive spirometer utilization index) is a score of 10 points per hour if over 10 times from 9 am to 9 pm for 2 days, with a total maximum score of 240.
bSUS: System Usability Scale.
