Median values of demographic and glycemic exposure variables in the RDNS cohort to the end of 2004
| . | n . | Median (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) |
| . | n . | Median (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.