ALB and major depressive disorder: As shown in Table 1, age, sex, body mass index, proportions of chronic pain (Figure 1) and mental worker, and levels of red blood cell, hemoglobin, urine acid, creatinine, alanine aminotransferase, aspartate aminotransferase, total protein, and albumin had statistically significant difference between participants with and without late-life depression (p  < 0.05 for all).