Table 3.

Correlations between mean expert score and objective indices

	MES	FEV1	FVC	FEV1/FVC	FEF25–75%	FEF50	kmax	PEFR	zβ Angle	FEF50/PEFR	MMEF/FVC	${\overline{f}}_{\text{b}1}^{\text{′′}}$
FEV1	−0.554	1
FVC		0.818	1
FEV1/FVC	−0.931	0.468		1
FEF25–75%	−0.816	0.817	0.383	0.796	1
FEF50	−0.824	0.826	0.391	0.807	0.994	1
kmax	0.757	−0.668		−0.604	−0.764	−0.778	1
PEFR		0.874	0.769		0.664	0.674		1
zβ Angle	−0.959	0.470		0.923	0.728	0.750	−0.724		1
FEF50/PEFR	−0.938	0.420		0.911	0.765	0.776	−0.692		0.944	1
MMEF/FVC	−0.887	0.413		0.944	0.825	0.821	−0.572		0.856	0.928	1
${\overline{f}}_{\text{b}1}^{\text{′′}}$	0.594	−0.541	−0.399	−0.522	−0.462	−0.481	0.787	−0.313	−0.676	−0.549	−0.429	1
${\overline{f}}_{\text{b}2}^{\text{′′}}$	0.580	−0.332		−0.530	−0.546	−0.536	0.438		−0.573	−0.667	−0.658	0.416

Definition of abbreviations: FEF_25–75% = forced expiratory flow between 25 and 75% of total lung volume; FEF₅₀ =  forced expiratory flow at 50% of total lung volume; MES = mean expert score; MMEF = maximum mid-expiratory flow; PEFR = peak expiratory flow rate; for other abbreviations, see text.

Shown are Pearson correlation coefficients (r) for significant (P < 0.05) correlations. Correlations range from r = 1.0 to r = –1.0.