Table 2.

Correlation between the numbers of patients with different disease severities according to the JRS severity system and GAP staging model

	JRS severity system
	Stage I	Stage II	Stage III	Stage IV
GAP staging model
Stage I	111	14	34	7
Stage II	58	4	24	22
Stage III	10	0	13	18

JRS, Japanese Respiratory Society; GAP, gender–age–physiology