As shown in Table S2, after adjusting for age, sex, education level, residence, family monthly income, employment, pathology subtype, surgery, risk of malnutrition, and energy, both SOD (OR = 0.632; 95% CI 0.499, 0.800; p < 0.001) and GPx (OR = 0.962; 95% CI 0.943, 0.982; p < 0.001) activities were negatively correlated with CRCI in lung cancer patients. Here, SOD1 is linked to nutritional deficiency disease.