Diabetes Care, Vol 21, Issue 10 1674-1679, Copyright © 1998 by American Diabetes Association
Puberty, IDDM, and death in Japan. Diabetes Epidemiology Research International Study Group
R Nishimura, N Tajima, M Matsushima and RE LaPorte
Department of Medicine (III), Jikei University School of Medicine, Tokyo, Japan. rimei+@pitt.edu
OBJECTIVE: To investigate the impact of age at onset on the prognosis of
childhood IDDM in Japan. RESEARCH DESIGN AND METHODS: The study population
consisted of 987 prepubertal-onset and 345 pubertal-onset IDDM cases who
were registered by two nationwide surveys and who were diagnosed between
1965 and 1979. The living status was identified as of 1 January 1990 with
the ascertainment rate of 96.5%. Prognosis was evaluated by cause- and
age-specific mortality rates and life-table analyses; in addition, an
attained-age-matched case-control study was analyzed by conditional
logistic regression. RESULTS: The adjusted mortality rates per 100,000
person-years for the pubertal-onset cases were significantly higher than
those of the prepubertal-onset cases (835 [95% CI 573-1,168] vs. 391
[283-526]). Life-table analyses revealed that the survival rate of the
pubertal-onset cases was lower than that of the prepubertal-onset cases for
each observation period. Life-table analyses after the age of 15 years
indicated that the prognosis of pubertal cases was almost the same as that
of the prepubertal cases despite having a shorter duration of diabetes. The
attained-age-matched case-control study indicated that the pubertal onset
was a potent determinant of death. CONCLUSIONS: The prognosis of
pubertal-onset IDDM was considerably poorer than that of prepubertal-onset
IDDM.