Regarding nutritional status, many studies have been reported on COPD patients, and body weight, body mass index, and serum albumin levels have been used as indices for evaluating nutrition in these patients (Cano et al., 2002; Suzuki et al., 2018; Tóth et al., 2004; Zhou et al., 2013). Here, ALB is linked to chronic obstructive pulmonary disease.