Abstract: Objective　To describe the periodontal health status among people in Jiangsu aged 35-74 and explore the risk factors of periodontitis, and to provide information supporting for the prevention and treatment of periodontal diseases in middle-aged and elderly people. Methods　A stratified, multistage, equal-capacity, randomized sampling design was applied to obtain three groups’ samples, including 146 people aged 35-44, 153 people aged 55-64 and 148 people aged 65-74. Gingival bleeding，dental calculus，periodontal pocket，and attachment loss were checked by using CPI probe according to the Guideline for the fourth National Oral Health Survey. A questionnaire survey was conducted. Results　In the age group of 35-44, 55-64 and 65-74, the mean affected teeth and the prevalence rates of gingival bleeding were 11.3(95.2%), 11.3(95.4%), 8.2(87.2%). The mean affected teeth and the prevalence rates of dental calculus were 21.3(100%), 21.5(99.4%), 18.0(98.0%). The mean affected teeth and the prevalence rates of shallow periodontal pocket were 1.6(38.4%), 3.0(64.1%), 2.3(53.4%). The mean affected teeth and the prevalence rates of deep periodontal pocket were 0.1(2.1%), 0.3(13.1%),0.2(10.1%). The mean affected teeth and the prevalence rates of attachment loss were 1.2(32.2%), 6.0(76.5%), 6.4(87.2%), and the prevalence rates of periodontal health were 2.1%, 0.7% and 4.1%. The univariate analysis showed that the periodontitis was associated with age, gender, education background and smoking (P<0.05). In the multivariate logistic regression analysis, the risk factor of periodontitis was age (P<0.05). Conclusion　Periodontal health and oral hygiene of middle-aged and elderly people in Jiangsu are poor. Age, gender, education background and smoking may be the related factors affecting periodontal health. Therefore, it is necessary to strengthen the oral prevention and health care of the middle-aged and elderly people, and try to improve the oral health.

Key words: Middle aged and elderly people Periodontitis Risk factors Jiangsu