Table 1

Demographic characteristics of the Allegheny County Type 1 Diabetes Registry cohort by sex and race as of 1 January 2008

MaleFemaleCaucasianAfrican AmericanTotal
n558517996791,075
Vital status confirmed97.8 (546)96.1 (497)97.7 (973)88.6 (70)§97.0 (1,043)
Male52.7 (525)43.0 (34)52.0 (559)
Caucasian94.1 (525)91.1 (471)92.7 (996)
Diagnosis
    1965–1969*32.0 (179)34.1 (176)32.9 (328)34.2 (27)33.0 (355)
    1970–1974*38.1 (213)34.4 (178)36.7 (366)31.6 (25)36.4 (391)
    1975–1979*29.7 (166)31.5 (163)30.3 (302)34.2 (27)30.6 (329)
Age at diabetes diagnosis (years)11.0 ± 4.310.8 ± 4.010.8 ± 4.211.4 ± 4.310.9 ± 4.2
Mean diabetes duration (years)32.4 ± 6.931.5 ± 8.232.3 ± 7.427.3 ± 8.0§31.9 ± 7.6
Mean age (years)43.4 ± 7.642.3 ± 8.443.2 ± 7.938.7 ± 8.6§42.8 ± 8.0
Person-years of follow-up18,082.316,280.832,202.62,160.634,363.1
  • Data are % (n) or means ± SD.

  • *Ascertainment rates by diagnosis cohort: 1965–1969, 96.6%; 1970–1974, 97.4%; and 1975–1979, 97.0%.

  • †Diabetes duration and age at death or last follow-up.

  • P < 0.05;

  • §P < 0.01.