Table 4.
Lung function test results in patients with and without atelectasis.
| Atelectasis (n = 55) | Non-atelectasis (n = 55) | P | |
|---|---|---|---|
| FVC pre-atelectasis (% pred.) | 73.7 ± 22.9 | 93.5 ± 27.9 | <0.001 |
| FVC pre-atelectasis (z-score) | −2.6 ± 1.8 | −0.9 ± 1.7 | <0.001 |
| FEV1 pre-atelectasis (% pred.) | 58.7 ± 26.5 | 84 ± 29.6 | <0.001 |
| FEV1 pre-atelectasis (z-score) | −3.5 ± 1.9 | −1.7 ± 1.9 | <0.001 |
| FEV1/FVC pre-atelectasis (% pred.) | 68.2 ± 15.8 | 78.4 ± 13.6 | 0.001 |
| FEV1/FVC pre-atelectasis (z-score) | −2.3 ± 1.6 | −1.3 ± 1.5 | <0.001 |
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity.
Data are presented as the mean ± standard deviation.
Comparisons between groups were made using the unpaired Student’s t-test or Mann–Whitney U test.
Pre-atelectasis pulmonary function tests were performed before the first episode of atelectasis (the period should be shorter than 1 month).