Table 4.

Pulmonary function test results - lung function changes in asymptomatic and symptomatic patient

PFT result	Biomass fuel group			Nonbiomass fuel group (LPG group)			P
	Asymptomatic (n=21)	Symptomatic (n=149)	Total (n=170)	Asymptomatic (n=39)	Symptomatic (n=101)	Total (n=140)
Normal spirometry (%)	21	28	49 (28.82)	39	68	107 (76.43)	<0.001
Pure obstructive defect (%)	0	46	46 (27.06)	0	8	8 (5.71)
Mild obstruction	0	0	0	0	0	0
Moderate obstruction	0	0	0	0	2	2
Moderately severe obstruction	0	6	6	0	6	6
Severe obstruction	0	32	32	0	0	0
Very severe obstruction	0	8	8	0	0	0
Possible restrictive defect (%)	0	36	36 (21.18)	0	22	22 (15.71)
Mild	0	1	1	0	2	2
Moderate	0	5	5	0	8	8
Moderately severe	0	29	29	0	10	10
Severe	0	1	1	0	2	2
Mixed defect (%)	0	39	39 (22.94)	0	3	3 (2.14)

Symptomatic - defined as having either breathlessness, wheezing, or chronic cough. PFT=Pulmonary function tests, LPG=Liquefied petroleum gas