Table 1.

Participant characteristics at DCCT baseline

CharacteristicAll ParticipantsBy Number of iGFR Measurements
Participants with Two or Three iGFR MeasurementsParticipants with One iGFR MeasurementParticipants with No iGFR Measurements
n1441977357107
Age (yr)26.8 (7.1)27.2 (6.9)25.7 (7.5)26.6 (7.3)
Women680 (47.2%)422 (43.2%)195 (54.6%)63 (58.9%)
Caucasian race1390 (96.4%)941 (96.3%)346 (96.9%)103 (96.3%)
Duration of diabetes (yr)5.9 (4.2)5.5 (4.0)6.7 (4.4)6.5 (4.3)
DCCT treatment assignment
 Intensive711 (49.3%)486 (49.7%)174 (48.7%)51 (47.7%)
 Conventional730 (50.7%)491 (50.3%)183 (51.3%)56 (52.3%)
Active smoking304 (21.1%)204 (20.9%)77 (21.6%)23 (21.5%)
Body mass index (kg/m2)23.5 (2.8)23.6 (2.8)23.2 (2.8)23.3 (3.0)
Systolic BP (mmHg)114.5 (11.4)114.5 (11.3)114.5 (11.3)114.8 (12.0)
Diastolic BP (mmHg)73.0 (8.5)73.3 (8.3)72.5 (8.8)72.9 (8.4)
Hemoglobin A1c9.1 (1.6)9.0 (1.6)9.2 (1.7)9.2 (1.6)
Albumin excretion rate (mg/d)11.5 (7.2, 18.7)10.1 (5.8, 17.2)11.5 (5.8, 23.0)11.5 (7.2, 21.6)
Creatinine clearance (ml/min per 1.73 m2)128.4 (29.8)128.2 (28.9)129.0 (32.2))128.1 (29.4)
Serum creatinine (mg/dl)0.68 (0.14)0.69 (0.13)0.65 (0.15)0.65 (0.15)
Serum cystatin C (mg/L)0.62 (0.10)0.64 (0.10)0.59 (0.08)0.58 (0.07)
  • Cell contents are mean (SD), N (%), or median (IQR) for albumin excretion rate.