| FOT | Forced oscillation technique |
| Rrs | Respiratory resistance |
| Xrs | Respiratory reactance |
| R5–19 | Difference in respiratory resistance between 5 Hz and 19 Hz |
| Rtot 5 | Mean resistance of the whole breath at 5 Hz |
| Xtot 5 | Mean reactance of the whole breath at 5 Hz |
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