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

Table 3 Adjusted prevalence ratios (95% confidence interval) for different categories of respiratory impairment by body mass index

	Underweight	Normal	Overweight	Obese	p value for trend
OLD	1.94 (0.77~4.90)	1.00	0.77 (0.59~0.99)	0.59 (0.40~0.86)	< 0.001***
RLD	0.79 (0.29~2.14)	1.00	1.40 (1.04~1.87)	1.25 (0.81~1.93)	0.059
MLD	0.49 (0.13~1.91)	1.00	1.10 (0.69~1.74)	0.75 (0.36~1.56)	0.807
COPD	2.82 (1.07~7.39)	1.00	0.76 (0.55~1.06)	0.59 (0.34~1.02)	0.006**
COPD mild	1.36 (0.30~6.19)	1.00	0.69 (0.46~1.01)	0.42 (0.21~0.85)	0.004**
COPD moderate/severe/very severe	3.89 (1.28~11.87)	1.00	0.95 (0.58~1.57)	0.94 (0.44~2.02)	0.397

Note: Adjusted for age, residence, gender, education level, occupation, smoking status, family history of lung diseases. *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