Population measured under field conditions | Population measured under standardised conditions | ||
---|---|---|---|
Short term variability | Long term variability | Long term variability | |
Rint=interrupter resistance; SDw=within-subject standard deviation. | |||
*Z scores calculated as (measured Rint – predicted Rint)/(RSD of the reference population). Predicted Rint values calculated based on regression equation by Merkus et al.1 | |||
Mean (SD), range baseline Rint (kPa/l/s) | 0.99 (0.22) (0.60–1.41) | 0.97 (0.20) (0.60–1.29) | 0.85 (0.21) (0.55–1.31) |
Mean baseline Rint Z score* | 0.59 | 0.41 | 0.11 |
SDw (kPa/l/s) | 0.10 | 0.13 | 0.10 |