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Original ArticleOpen Access
Incidence of Type 1 Diabetes in Children Under 15 Years in Northern Thailand, from 1991 to 1997
Unachak K 
,
Tuchinda C
,
Tuchinda C KEVALEE UNACHAK,M.D.*,
CHANIKA TUCHINDA, M.D.**
The annual incidence of Type 1 diabetes in children under 15 years in northern Thailand
from 1991 to 1997 was a retrospective study by analyzing the data gathered from the Pediatric
Endocrine Division, Faculty of Medicine, Chiang Mai University and through a mail survey to 202
hospitals in the government and private sector in northern Thailand. The response to the mail sur-
vey from 1991 to 1992 and 1993 to 1997 was 90.1 per cent and 94.5 per cent respectively.
During the seven year period, 76 new cases of Type 1 diabetes were identified. The crude
annual incidence ranged from 0.31-0.56 /100,000 per year, with an average incidence of 0.37/
100,000 per year (95% C.l
=
0.29-0.46). This very low figure had risen 2.2 fold (over 100%) from
that reported in 1984. The annual incidence was relatively constant from 1991 to 1996, although
there was a moderate rise in 1997 (0.56/100,000 per year). There was no statistically significant
difference between the annual incidence of 1996 and 1997. It remains for further studies to con-
firm the trend of increased incidence.
The median age of onset was 11 years, whereas, the peak age of onset occurred
in
the 10-
14 year age group of both sexes. There was a greater incidence among female in this study.
These data confirm the need to develop a national registry of Type 1 diabetes for further
epidemiological research.
Key word : Type 1 Diabetes, Children, Incidence, Northern Thailand
CHANIKA TUCHINDA, M.D.**
The annual incidence of Type 1 diabetes in children under 15 years in northern Thailand
from 1991 to 1997 was a retrospective study by analyzing the data gathered from the Pediatric
Endocrine Division, Faculty of Medicine, Chiang Mai University and through a mail survey to 202
hospitals in the government and private sector in northern Thailand. The response to the mail sur-
vey from 1991 to 1992 and 1993 to 1997 was 90.1 per cent and 94.5 per cent respectively.
During the seven year period, 76 new cases of Type 1 diabetes were identified. The crude
annual incidence ranged from 0.31-0.56 /100,000 per year, with an average incidence of 0.37/
100,000 per year (95% C.l
=
0.29-0.46). This very low figure had risen 2.2 fold (over 100%) from
that reported in 1984. The annual incidence was relatively constant from 1991 to 1996, although
there was a moderate rise in 1997 (0.56/100,000 per year). There was no statistically significant
difference between the annual incidence of 1996 and 1997. It remains for further studies to con-
firm the trend of increased incidence.
The median age of onset was 11 years, whereas, the peak age of onset occurred
in
the 10-
14 year age group of both sexes. There was a greater incidence among female in this study.
These data confirm the need to develop a national registry of Type 1 diabetes for further
epidemiological research.
Key word : Type 1 Diabetes, Children, Incidence, Northern Thailand
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