Fig. 1
Relationship between serum bicarbonate and risk of incident coronary heart disease in patients with type 2 diabetes without CHD at baseline shown by restricted cubic spline modeling (solid line with reference 28 mmol/L and the optimum 3 knots) and 95 % confidence intervals (dashed lines) after adjustment for age as time scale, age at baseline, sex, fluency in English, diabetes duration, loge(serum triglycerides), loge(urinary albumin: creatinine ratio), peripheral sensory neuropathy and peripheral arterial disease