Adjusted HRs (95% CI) for liver disease hospitalization by baseline HbA1c value. The HR is expressed per absolute increase in one percentage point in the HbA1c value at baseline. The shaded area is the 95% CI from the restricted cubic spline model. The model is centered at the median (5.5%) with knots at the 20th, 40th, 60th, and 80th percentiles. The HRs were adjusted for age, sex, race, field center, total and HDL cholesterol, BMI, waist-to-hip ratio, hypertension, family history of diabetes, education level, alcohol use, physical activity, smoking status, hemoglobin, MCV, fibrinogen, and leukocyte count. The HRs are shown on a natural log scale.