Mean spirometry and plethysmography measurements for the lung pattern labels
| Lung conditions | First 477 patients (2582 tests) collected June 2018–March 2020 | Later 271 patients (1245 tests) collected July 2020–October 2021 | ||||||
| Normal | Obstructive | Restrictive | Obstructive and restrictive | Normal | Obstructive | Restrictive | Obstructive and restrictive | |
| No of tests (%) | 780 (30) | 335 (13) | 1130 (44) | 337 (13) | 276 (22) | 147 (12) | 643 (52) | 179 (14) |
| FEV1 (L) (%FEV1) | 3.06 (92.79) | 1.95 (63.51) | 2.24 (68.77) | 1.56 (48.12) | 2.97 (100.76) | 1.90 (58.69) | 2.20 (68.88) | 1.50 (43.59) |
| FVC (L) (%FVC) | 3.66 (86.90) | 3.27 (80.63) | 2.58 (63.77) | 2.51 (59.73) | 3.55 (93.93) | 3.39 (80.29) | 2.58 (62.21) | 2.66 (59.02) |
| FEV1/FVC (%FEV1/FVC) | 84.61 (107.76) | 59.16 (78.59) | 86.79 (107.73) | 61.96 (80.93) | 84.45 (108.02) | 55.94 (71.52) | 86.18 (110.16) | 56.19 (72.32) |
| FEF25-75 (L/s)(%FEF25-75) | 3.85 (142.22) | 1.24 (52.53) | 3.39 (121.02) | 1.00 (39.90) | 3.45 (144.23) | 1.03 (38.82) | 2.96 (113.17) | 0.72 (25.67) |
| TLC (L) (%TLC) | 5.79 (92.05) | 5.56 (89.99) | 4.26 (69.48) | 4.30 (69.22) | 5.43 (91.82) | 5.85 (91.60) | 4.11(65.19) | 4.67 (68.76) |
| RV (L) (%RV) | 2.08 (105.25) | 2.22 (111.76) | 1.66 (85.33) | 1.75 (92.03) | 1.85(91.78) | 2.31 (112.43) | 1.52 (75.93) | 1.96 (89.73) |
| RV/TLC (%RV/TLC) | 36.33 (102.12) | 40.50 (112.30) | 39.50 (109.56) | 41.11 (118.08) | 34.45 (89.61) | 39.92 (108.5) | 37.50 (103.79) | 42.23 (113.99) |
FEV1, FVC, TLC and RV are in litres, FEF25-75 in litres per second.
FEF, forced mid-expiratory flow; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; RV, residual volume; TLC, total lung capacity.