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Korean Journal of Preventive Medicine 1999;32(4): 435-442.
Twelve-year Incidence of Hypertension and Its Risk Factors in a Lean Population: the Kangwha Study.
Hyeon Chang Kim, Il Suh, Kang Hee Lee, Sun Ha Jee, Chang Soo Kim, Chung Mo Nam
1Graduate School of Health Science and Management, Yonsei University, Korea.
2Department of Preventive Medicine, Yonsei University College of Medicine, Korea.
OBJECTIVES: The purpose of this study was to examine the twelve-year incidence of hypertension, and to find risk factors for the incidence in adult population in Kangwha County, Korea. METHODS: In 1986, 413 males(mean age 37 years) and 434 females(mean age 33 years) were examined in the Kangwha Study. Among 764 non-hypertensive participants, 164 males and 214 females were reexamined in 1998. Blood pressure(BP) was measured with standard mercury sphygmomanometers. Multiple logistic regression analysis was used to estimate the relative risk of risk factors on the incidence of hypertension. RESULTS: During the 12-year period, 68 of 164 males and 53 of 214 females developed hypertension. In a multiple logistic model adjusted for age and pulse rate, baseline BP, baseline body mass index(BMI) and BMI change during the follow-up period were significantly related to the incidence of hypertension. Adjusted relative risk(RR)s of baseline high-normal BP were 3.90(95% CI: 1.81-7.84) in males, and 12.72(95% CI: 3.70-30.73) in females. Compared with lower baseline BMI group, adjusted RRs of middle baseline BMI group were 2.66(95% CI: 1.19-5.70) in males, and 2.33(95% CI: 0.95-5.55) in females. Adjusted RRs of upper baseline BMI group were 3.52(95% CI: 1.53-7.67)in males and 3.63(95% CI: 1.50-8.43) in females. Increase of BMI was positively related to the incidence in males(adjusted RR=2.71, 95% CI: 1.00-6.71) and females(adjusted RR=3.05, 95% CI: 1.29-6.88). CONCLUSIONS: The twelve-year incidence of hypertension was 41.5% in males, and 25.8% in females. Baseline BP, baseline BMI, and BMI change were strongly related to the incidence of hypertension.
Key words: Hypertension; Incidence; Risk factors; Body mass index
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