Table 5. Associations of protein intake and lung function in patients with mild to moderate chronic obstructive pulmonary disease.

Model	FEV1% predicted				FVC % predicted				FEV1/FVC
	β	Exp (β)	P value		β	Exp (β)	P value		β	Exp (β)	P value
Unadjusted	0.016	1.016	0.067		0.034	1.035	<0.001		0.00011	1.0001	0.003
1	0.021	1.022	0.017		0.048	1.049	<0.001		0.00009	1.0001	0.021
2	0.018	1.019	0.035		0.036	1.036	<0.001		0.00014	1.0001	<0.001
3	0.022	1.023	0.013		0.048	1.049	<0.001		0.0001	1.0001	0.006
4	0.022	1.022	0.015		0.048	1.048	<0.001		0.0001	1.0001	0.008

Model 1: weight; Model 2: smoking pack-years; Model 3: weight, smoking pack-years; Model 4: weight, smoking pack-years, household income.