Figure 1

Boxplots of HbA1c by various diagnostic criteria. Subdivisions in each of these groups are depicted by different coloured boxes (red-diabetes, green-impaired, blue-normal). The box encloses the middle 50 percent of patients, and the median is represented as a horizontal line inside the box. The whiskers are lines that extend from the box to the highest and lowest values excluding outliers. The left and right plots depict 2-hour and FPG subdivisions respectively while the upper and lower plots depict comparisons against single and combined criteria clusters respectively (CC = combined criteria). There were two outliers (shown in the plots as circles with the patient number) and they were selected based on being more than 1.5 box lengths from the ends of the box, but were included in the analysis in tables 1 &2. Diabetes was diagnosed in the same percentage (63%) of patient's according to either of the single criteria or the combined criteria. One quarter of the diabetics by each single criterion were not diabetic by the other single criterion.