Table 5.
Measures of validity of the EasyOne spirometer compared to laboratory spirometry in the clinical setting with spirometry-naive participants.
| Mean difference (95% confidence intervals) | 95% limits of agreement | Slope of line in Bland-Altman plots of absolute difference vs. mean value | ||
|---|---|---|---|---|
| β | P-value | |||
| FVC* (L) | −0.12 (−0.19, −0.04) | −0.48, 0.25 | −0.05 | 0.14 |
| FEV1† (L) | −0.17 (−0.23, −0.11) | −0.45, 0.11 | −0.06 | 0.04 |
| FEV1/FVC | −0.02 (−0.03, −0.01) | −0.05, 0.02 | 0.06 | 0.26 |
| FEV6‡ (L) | −0.14 (−0.21, −0.07) | −0.48, 0.19 | −0.05 | 0.14 |
| FEF25–75§ (L) | −0.27 (−0.40, −0.13) | −0.93, 0.40 | −0.04 | 0.37 |
| PEF∥ (L/sec) | 0.18 (−0.10, 0.45) | −1.18, 1.54 | 0.05 | 0.45 |
*
FVC = forced vital capacity
†
FEV1 = forced expiratory volume in one second
‡
FEV6 = forced expiratory volume in six seconds
§
FEF25–75 = forced expiratory flow between 25% and 75% of vital capacity
∥
PEF = peak expiratory flow rate