ALB and respiratory system disorder: The statistical analysis showed that albumin (adjusted odds ratio (aOR) = 0.928, P = 0.013), BMI < 18.5 kg/m2 (aOR = 4.968, P = 0.046), lesion number ≥ 3 (aOR = 4.229, P < 0.001), male (aOR = 2.252, P = 0.009), respiratory disease (aOR = 1.669, P = 0.046), and cardiovascular disease (aOR = 2.489, P = 0.027) were all related to the impairment of PF (Table 3).