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Table 3 Linear regression: standardized slopes (r) and P values; tests whether the slope is significantly different from zero. N = 237

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

Parameter

Standardized slope (r)

P value (significance from zero slope)

FEV1

0.37

<0.0001

%FEV1

0.10

0.1 (NS)

IC

0.27

<0.0001

%IC

0.05

0.46 (NS)

FIV1

0.20

0.002

%FIV1

0.13

0.045

PIF

0.20

0.002

%PIF

0.24

0.0002

MIF50

0.22

0.0009

%MIF50

0.14

0.0267

  1. 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. See also Figures 2 and 3 and the text for further explanation.
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BMC Pulmonary Medicine

ISSN: 1471-2466

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