| IntroductionBenign prostatic hyperplasia ( BPH) is the common and highly prevalent disease in the aged, arid has become one of the main diseases injuring the health of the elderly men. It was reported that the prevalence rate of BPH in city dweller is significantly higher than that of countryside dweller in Beijing, Shanghai and Guangzhou. Although there are numerous people living in the countryside in China, the study on the status and risk factors of BPH of the aged living in countryside is little at the present. We made massed investigation about BPH of the aged in Shengyang suburb in April 2001, and discussed the influencing factors on the prevalence of BPH. The study gives the basis of further controlling and decreasing the prevalence of BPH.Material and Method1. Investigation object. 4 countrysides were randomly selected in Shengyang suburb by clustering sampling method, and then 2 villages of every cauntrysida were selected at random. We investigated the aged male over 60 years in 8 villages living there over 20 years. There were 398 men aged 60 - 88 years involving the investigation, the mean age was(69.10±6.98)years old.2. Investigation content. General condition, diet manner, living habit, previous disease history and other else were included.3. Investigation method. Survey was performed with unificated questionnaire after physical examination made by specialist doctors.4. Diagnostic criterion of BPH. (l)clarified diagnosis of BPH was made above the degree of county hospital. (2)Urinary surgeon examined the prostate with digital examination of rectum, above I degree ( diameter > 3 cm) , What digital examination of rectum was not clear should be examined by B ultrasound measurement ( prostatic volume> 20ml, accompanied by difficulty of urination, the International Prostate Symptom Score (IPSS) 1^8 points) .5. Selection of case and control groups. A Case - control study was conducted in the study on influencing factor, 100 patients of BPH were randomized to the case group, and 100 non - BPH people constituted the control group. Controls matched with cases by age and living in the same village. The difference of age among the objects was 2 years old.6. Statistical analysis method. A database was created by SPSS, and SPSS V 10. 0 statistic software was used for analysis. Statistical method include x test, Logistic regression analysis.ResultI. Age and BPH of the elder men in Shenyang suburb The investigation showed that the total incidence rate of BPH of the aged in Shenyang suburb was 37, 94% , Moreover, each 5 year increase in age predicted a 5% increase in BPH. The incidence rate in each group was significantly different after analysis (p <0.01).II. The incidence rate of BPH and previous vocation and cultural degree of the aged in Shenyang suburbThere was no significant difference among the various kinds of vocation and different cultural degree of the aged in Shengyang suburb (P>0.05).III. Monovariate analysis on the correlative risk factors of BPH of the aged in Shenyang suburbFactors such as body mass index, marital age, cigarette smoking, alcohol intake, meat and vegetable intake in the beginning of 1980's, sex activity frequency ( Frequency/week) , hypertension, tuberculosis and prostatitis were analyzed by monovariate analysis. The analysis showed that there was obvious significance in body mass index, cigarette smoking, alcohol intake, meat intake in the beginning of 1980's and prostatitis. P value was 0. 031, 0.01, 0.07, 0. 000, 0. 009 and 0.000, respectively. Among them, meat intake in the beginning of 1980's, hypertension, prostatitis and body mass index were risk factors of BPH, cigarette smoking and alcohol intake were protective factors and could decrease the incidence of BPH. Other factors such as tea drinking, vegetable intake in the beginning of 1980's, marital age, sex activity frequency ( Frequency/week) and tuberculosis had no statistical significance with BPH.IV. Different degree of each...
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