[Epidemiology of type 1 diabetes mellitus in Bydgoszcz region in the years 1997-2002].
BACKGROUND
Type 1 diabetes mellitus belongs to the diseases most often appearing in the developmental age. The incidence of this disease is characterized by the constant dynamic increase.


OBJECTIVE
The purpose of this work was to estimate the value and the dynamics of the incidence of type 1 diabetes mellitus in children from Bydgoszcz region and its analysis according to sex, age, place of residence and season of diabetes diagnosis.


METHODS
In the period from 1997 to 2002 type 1 diabetes mellitus was recognized in 161 children (80 boys and 81 girls) up to the 14th age of life in separate age groups: 0-4 years: 20; 5-9 years: 68; 10-14 years: 73. The incidence was estimated with the help of an index which was the number of new-recognized type 1 diabetes mellitus cases during one year in the population of 100 000. The number of population was taken from Demographic Yearbook of Provincial Office.


RESULTS
The average annual index of the incidence for the six-year period being analyzed was 13.55, it balanced in the following years from 9.44 (1997) up to 15.28 (2002). The highest index of incidence (16.34) was noted in 2000 year. The increase in number of falling ill was observed in groups: 5-9 years old and 10-14 years old. Rarely the diabetes was recognized in the youngest children. The diabetes was almost twice more often recognized in children living in towns (16.30) in comparison with those living in the country (8.84). Revelation of the diabetes takes place mainly in the autumn and winter months. The least number of falling ill was noted in June. The seasonal incidence was observed mainly in children over 5 years.


CONCLUSIONS
1. The index of the type 1 diabetes mellitus incidence among 0-14 year old children was 13.55. 2. During the years 1997-2002 this index increased from 9.44 to 15.28. 3. The diabetes was almost twice more often recognized in children living in towns. 4. The number of becoming ill depends on the season of the year.
Oddział Pediatrii i Endokrynologii Wojewódzkiego Szpitala Dzieciecego w Bydgoszczy, Bydgoszcz, Poland.
Olgierd
O
Pilecki
Katarzyna
K
Robak-Kontna
Dariusz
D
Jasiński
Zofia
Z
Boguń-Reszczyńska
Maria
M
Bojko-Zbikowska
D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D003922:Diabetes Mellitus, Type 1 / Q000453:epidemiology* / Q000517:prevention & control*; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D011044:Poland / Q000453:epidemiology; D012307:Risk Factors; D012424:Rural Population / Q000706:statistics & numerical data; D012621:Seasons; D017678:Sex Distribution; D012959:Socioeconomic Factors; D014505:Urban Population / Q000706:statistics & numerical data