Table 1—

Demographic characteristics of the DCCT subjects

Stimulated C-peptide group
UndetectableMinimalBaseline-onlySustained
n (%)634 (44)519 (36)130 (9)159 (11)
Intensive therapy* (%)52483655
Retinopathy at baseline* (%)7341819
Female (%)50454149
Age (years) (%)26 ± .3a27 ± .3a27 ± .3ab29 ± .6b
Duration (years)8.2 ± .1a4.5 ± .1b1.9 ± .3c2.3 ± .3c
HbA1c at eligibility9.3 ± .1a9.2 ± .1a8.4 ± .1b8.4 ± .1b
HbA1c at baseline9.0 ± .1a9.0 ± .1a8.4 ± .1b8.2 ± .1b
AER (mg/24 h) (95% CI)13.5a (12.6–14.4)10.0b (9.4–10.7)9.2b (8.3–10.7)9.7b (8.7–10.7)
  • *

    * Percentages differ significantly (χ2 test, P < 0.005). Where stimulated C-peptide group means differed significantly (P < 0.05), the groups with the same letter were indistinguishable. Data are n (%), %, means ± SE, or means (95% CI). All statistical comparisons are between stimulated C-peptide groups within a single row.