Table 3.

Clinical classification of severity in GATPC

Characteristic	Intermittent (Grade I)	Mild (Grade II)	Moderate (Grade III)	Severe (Grade IV)
symptoms	Less than once week	More than once week, < once a day	Everyday	Everyday
Limitation of activities and sleep	Transient	May be affect activities and sleep	Affect activities and sleep	Frequent
Nocturnal of symptoms/awakening	Less than twice a month	More than twice a month, < once a week	More than once week	Frequent
Lung function(PEF or FEV1)	≥80% predicted (FEV1)or personal best (PEF); mutation rate < 20%	≥80% predicted (FEV1)or personal best (PEF); mutation rate 20%~30%	60%~79% predicted (FEV1)or personal best (PEF); mutation rate > 30%	< 60% predicted (FEV1)or personal best (PEF); mutation rate > 30%