TABLE 4.
WITHIN-SUBJECT REPRODUCIBILITY OF REPEATED MEASUREMENTS APPROXIMATELY 1 MONTH APART
| n | Intraclass Correlation Coefficient (95% CI) | Mean Difference (Limits of Agreement)* | |
|---|---|---|---|
| FEF25–75 | 41 | 0.85 (0.73–0.92) | −3.8 ml/sec (−253.6, 246.1) |
| FEV0.5 | 41 | 0.90 (0.82–0.95) | 8.3 ml (85.4, 102.0) |
| FEF75 | 41 | 0.85 (0.74–0.92) | −9.2 ml/sec (−166.4, 148.1) |
| FVC | 41 | 0.93 (0.87–0.96) | 25.0 ml (−82.5, 132.4) |
| FRC | 62 | 0.93 (0.89–0.96) | 7.5 ml (−62.7, 77.7) |
| RV | 40 | 0.85 (0.73–0.92) | −5.5 ml (−91.4, 80.4) |
| TLC | 40 | 0.94 (0.90–0.97) | 21.0 ml (−117.4, 159.4) |
| FRC:TLC | 40 | 0.77 (0.61–0.87) | −0.8 (−8.6, 6.9) |
| RV:TLC | 40 | 0.70 (0.50–0.83) | −0.02 (−0.12, 0.09) |
Definition of abbreviations: CI = confidence interval; FEF25–75 = 25–75% of forced expiratory flow; FEF75, 75% of FEF; RV = residual volume; TLC = total lung capacity.
*
Limits of agreement = 1.96 × SD of the difference.