CHI3L1 and type 2 diabetes mellitus: YKL-40 showed a pattern of a small postprandial decrease followed by an increase on all study days for the type 2 diabetes group (P values ≤ 0.021 for all) and at 1 wk for the NGT group (P = 0.038), whereas the changes before the operation and at 3 mo and 1 yr were nonsignificant (Figure 1(a)).