Random variation of inspiratory lung function parameters in patients with COPD: a diagnostic accuracy study

BMC Pulmonary Medicine

Table 4 Coefficients of repeatability (CR) retested after one hour (n = 237), after five hours (n = 79) and after 3-10 days (n-76) (in % from initial value/absolute value)

Parameter	Retest after one hour	Retest after five hours	Retest another day
FEV1	11.8	13.7	17.9
IC	18.9	21.3	22.7
FIV1	13.5	17.9	18.0
PIF	17.9	17.8/0.90	17.9/0.85
MIF50	20.4	21.0	19.2

FEV1 = Forced Expiratory Flow in one second; FIV1 = Forced Inspiratory Flow in One second; IC- Inspiratory Capacity; MIF50 = Maximal Inspiratory Flow at 50%; PIF = peak Inspiratory Flow.

ISSN: 1471-2466