Our results showed that compared with the non-malnutrition group, the levels of some nutritional indicators including hemoglobin (p = 0.040), albumin (p = 0.015) and prealbumin (p = 0.021) were significantly lower in the malnutrition group; however, there was no difference of vitamin D levels between the two groups (Figure 3). Here, TTR is linked to malnutrition.