Associations between different body mass index and lung function impairment in Chinese people aged over 40 years: a multicenter cross-sectional study

Table 2 Distribution of respiratory impairment among subjects with different body mass index

	OLD	RLD	MLD	COPD	COPD mild	COPD moderate/severe/very severe
Underweight	13 (33.4)	9 (7.7)	3 (1.6)	9 (25.8)	4 (9.7)	5 (16.1)
Normal	381 (27.2)	240 (10.9)	102 (4.4)	215 (14.9)	148 (9.4)	67 (5.5)
Overweight	272 (21.4)	200 (12.6)	74 (4.0)	119 (10.1)	68 (5.4)	51 (4.7)
Obese	76 (19.4)	65 (12.1)	17 (3.0)	29 (8.9)	17 (4.1)	12 (4.8)
p value for trend	0.002**	0.239	0.39	0.001**	< 0.001***	0.24

Note: Data are presented as n (prevalence rate). *P<0.05; **P< 0.01; ***P<0.001.
Abbreviations: OLD, obstructive lung disease; RLD, restrictive lung disease; MLD, mixed lung disease; COPD, chronic obstructive pulmonary disease

ISSN: 1471-2466