Objective: To investigate the prevalence rates of the different subtypes of hypertension and related risk factors in adults from Tianjin.
Methods: With multi-stage randomized cluster sampling method, 20 346 people aged 18 years and over were selected from both urban and rural areas of six geographical regions in Tianjin in 2006. A cross-sectional study was conducted. The prevalence rate of isolated systolic hypertension (ISH), isolated diastolic hypertension (IDH), systolic and diastolic hypertension (SDH) and associated risk factors were analyzed with SPSS 17.0 software.
Results: The prevalence rates of hypertension in adults of Tianjin were 7.16% for ISH (standardized rate was 5.33%), 7.09% for IDH (standardized rate was 6.50%), and 13.61% for SDH (standardized rate was 9.94%) respectively. The ISH prevalence rate was lower than that of national rate of 7.6%, but the prevalence rates of IDH and SDH were higher than that of national rates of 4.4% and 7.4% respectively. The results from logistic regression model analyses indicated that the odds ratio (ORs) for combined risk factors of ISH, IDH and SDH in Tianjin that associated with factors as: lower level of education, living in rural areas were 1.291 (95%CI: 1.114 - 1.497), 1.790 (95%CI: 1.533 - 2.091) and 2.117 (95%CI: 1.879 - 2.386) respectively; ageing were 1.080 (95%CI: 1.073 - 1.086), 1.015 (95%CI: 1.010 - 1.020) and 1.055 (95%CI: 1.050 - 1.060) respectively; alcohol assumption were 1.244 (95%CI: 1.036 - 1.492), 1.199 (95%CI: 1.024 - 1.404) and 1.532 (95%CI: 1.345 - 1.744) respectively; overweight were 1.560 (95%CI: 1.358 - 1.792), 1.634 (95%CI: 1.429 - 1.869) and 2.104 (95%CI: 1.890 - 2.342) respectively; obesity were 2.216 (95%CI: 1.861 - 2.640), 3.125 (95%CI: 2.658 - 3.674) and 3.852 (95%CI: 3.383 - 4.385) respectively; impaired fasting glucose were 1.666 (95%CI: 1.327 - 2.092), 1.440 (95%CI: 1.126 - 1.841) and 1.872 (95%CI: 1.572 - 2.230) respectively.
Conclusion: The prevalence rate of the different subtypes of hypertension was quite high in the population of Tianjin city and different measurements on prevention and treatment should be taken according to different subtypes of hypertension.