Fig. 2

Kaplan–Meier curves for the 1-year all-cause mortality according to quartiles (Q1-4) of glucose variability. The range of coefficient of variation (CoV) in the quartiles was < 16.1; 16.1–28.5; 28.5–43.9; > 43.9 (%) in the study population; < 13.2; 13.2–22.8; 22.8–35.4; > 35.5 (%) in the non-diabetes group; and < 23.5; 23.5–37.5; 37.5–51.9; > 51.9 (%) in the type 2 diabetes group. Q1: quartile 1; Q2: quartile 2; Q3: quartile 3; Q4: quartile 4. P-values were calculated using log-rank statistics