Table 3. Kappa coefficients between gas exchange indices in sarcoidosis.

Variable	Kappa coefficient	95% CI	P
DLco/∆SpO2-6MWT	0.21	0.08–0.33	0.002
DLco/peak AaDO2	0.42	0.27–0.57	0.0003
∆SpO2-6MWT/peak AaDO2	0.27	0.15–0.42	0.002

6MWT, 6-minute walk test; ∆SpO₂-6MWT, oxygen desaturation during the 6MWT; AaDO₂, alveolar-to-arterial oxygen pressure difference; DLco, diffusing capacity of the lung for carbon monoxide.