Rapid increase in the incidence of clinically diagnosed type 2 diabetes in Chinese in Harbin between 1999 and 2005.
OBJECTIVE
To examine the recent trend in the incidence of clinically diagnosed type 2 diabetes during the period of 1999-2005 in Harbin, China.


METHODS
The records of newly diagnosed type 2 diabetes from hospitals and clinics in Harbin were reported to the Harbin Centre for Disease Control and Prevention. About 3 million (33%) of the total population were from six metropolitan districts and over 6 million (67%) from the surrounding counties. Incidence rates and incidence rate ratios (IRR) were estimated using Poisson regression.


RESULTS
During the observational period, 26,953 new cases of diagnosed type 2 diabetes were reported. Among them, 16,367 were from the metropolitan region and 10,586 from the surrounding counties. The incidence rate of type 2 diabetes in the metropolitan region was 3.19 (95% CI: 3.11, 3.27) times as high as that in the surrounding counties. Females had higher incidence rates in younger age groups (<54 years) and lower rates in older age groups (55+ years) than their male counterparts. The incidence increased over time during the period of 1999-2005 by an average of 12% per year (IRR=1.12, 95% CI: 1.11, 1.13). Similar increasing rates were observed in both the county and metropolitan regions.


CONCLUSIONS
The incidence of diagnosed type 2 diabetes has increased dramatically in recent years. Although an increasing trend in the incidence of type 2 diabetes exists in both metropolitan and county regions, the county region currently has a substantially lower incidence rate than the metropolitan region.
Liu
Meina
M
Department of Epidemiology and Biostatistics, Public Health College, Harbin Medical University, Harbin, China.
Wang
Zhiqiang
Z
Sun
Xuebin
X
Chen
Yinping
Y
Zhang
Qiuju
Q
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002681:China / Q000453:epidemiology; D003924:Diabetes Mellitus, Type 2 / Q000175:diagnosis* / Q000453:epidemiology*; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012737:Sex Factors