Fig. 4From: Preventing misdiagnosis of diabetes in the elderly: age-dependent HbA1c reference intervals derived from two population-based study cohortsSex-specific associations between age and HbA1c levels by groups of body mass index (BMI) in the whole SHIP-0 and SHIP-Trend population assessed by linear regression with restricted cubic splines (in case of significant likelihood ratio test, see Methods section)Back to article page