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Table 1—

Median values of demographic and glycemic exposure variables in the RDNS cohort to the end of 2004

nMedian (range)
First visit   
    Age (years) 327 56.0 (13.0–86.0) 
    Mean FPG (mg/dl) 326 158.0 (28.0–456.0) 
    Mean A1C (%)* 325 7.9 (4.7–13.7) 
    Age at onset of diabetes (years) 327 48.2 (3.5–82.4) 
    GEi 325 4.7 (3.5–6.0) 
    Mean systolic blood pressure (mmHg) 317 136.0 (88.0–204.0) 
    Mean diastolic blood pressure (mmHg) 317 78.0 (50.0–110.0) 
Averaged over time   
    Mean FPG (mg/dl) 327 165.4 (95.3–313.3) 
    Mean A1C (%)* 327 7.8 (5.2–12.4) 
    Mean systolic blood pressure (mmHg) 327 132.4 (98.4–182.5) 
    Mean diastolic blood pressure (mmHg) 327 76.1 (54.8–100.7) 
First visit to last visit   
    Number of evaluations of FPG 327 27.0 (2.0–70.0) 
    Number of evaluations of A1C 327 27.0 (2.0–70.0) 
Last visit   
    Duration of diabetes (years) 327 18.0 (3.4–73.8) 
    Duration of follow-up (years) 327 7.8 (1.4–20.0) 
nMedian (range)
First visit   
    Age (years) 327 56.0 (13.0–86.0) 
    Mean FPG (mg/dl) 326 158.0 (28.0–456.0) 
    Mean A1C (%)* 325 7.9 (4.7–13.7) 
    Age at onset of diabetes (years) 327 48.2 (3.5–82.4) 
    GEi 325 4.7 (3.5–6.0) 
    Mean systolic blood pressure (mmHg) 317 136.0 (88.0–204.0) 
    Mean diastolic blood pressure (mmHg) 317 78.0 (50.0–110.0) 
Averaged over time   
    Mean FPG (mg/dl) 327 165.4 (95.3–313.3) 
    Mean A1C (%)* 327 7.8 (5.2–12.4) 
    Mean systolic blood pressure (mmHg) 327 132.4 (98.4–182.5) 
    Mean diastolic blood pressure (mmHg) 327 76.1 (54.8–100.7) 
First visit to last visit   
    Number of evaluations of FPG 327 27.0 (2.0–70.0) 
    Number of evaluations of A1C 327 27.0 (2.0–70.0) 
Last visit   
    Duration of diabetes (years) 327 18.0 (3.4–73.8) 
    Duration of follow-up (years) 327 7.8 (1.4–20.0) 
*

The mean A1C values were calculated with reference to DCCT standards. The corresponding mean A1C values using International Federation of Clinical Chemistry standards have a median of 6.3% and range of 2.9–12.6% at the first visit. The median (range) is 6.2% (3.3–12.2) for visits averaged over time. The mean difference between the first visit and visits averaged over time for A1C (percent) is 0.1692 (P = 0.0054) using DCCT standards.

GEi = −2.7912 + 3.7961 × A1C1/4 + 0.7478 × duration of diabetes1/4 + −0.0725 × age of onset of diabetes1/4. Its derivation is provided in results. A1C is measured using DCCT standards.

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