Is the incidence of diabetes increasing in all age-groups in The Netherlands? Results of the second study in the Dutch Sentinel Practice Network.
OBJECTIVE
To assess possible changes in the incidence of diabetes in all age-groups in The Netherlands during a 10-year period (1980-1983/1990-1992).


METHODS
Since 1970, a network of sentinel stations (the Dutch Sentinel Practice Network) consisting of approximately 1% of the Dutch population has been in operation to gain insight into the morbidity patterns of the Dutch population as recorded by general practitioners. One of the items recorded from 1990 to 1992 was the incidence of diabetes. The first study with a similar design that registered the incidence of diabetes was conducted from 1980 to 1983.


RESULTS
The overall incidence of diabetes increased significantly by 12.1% in the period between the two studies. This overall increase can largely be attributed to a statistically significant increase in the age-group 45-64 years (30.5%). Although not statistically significant, the 36% increase of diabetes in the age-group 0-19 years is in accordance with the increase of type I diabetes based on the first and second nationwide retrospective studies covering the total Dutch population.


CONCLUSIONS
There is a marked increase in the incidence of diabetes in the age-group 45-64 years. This selective increase is probably not due to a real rise caused by changes in exposure to risk factors but to an earlier recognition of symptoms and signs of diabetes followed by blood glucose measurements and/or to more intensive case finding in general practice.
Ruwaard
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National Institute of Public Health and Environmental Protection, Netherlands. dirk.ruwaard@rivm.nl
Gijsen
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Bartelds
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Hirasing
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Verkleij
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Kromhout
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D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003920:Diabetes Mellitus / Q000453:epidemiology*; D005194:Family Practice; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D009426:Netherlands / Q000453:epidemiology; D012727:Sex Characteristics; D012737:Sex Factors