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Background and Objective: Self-injury (SI), also called self-mutilation or cutting, is highly stigmatized emotional disorder. The aim of this study was to estimate the incidence rate of self-injury among male pupils in Tabriz – North West in Iran and to evaluate the associated risk factors. Materials and Methods: In this longitudinal study of all the pupils high school in Tabriz, 1772 (13.7%) were randomly sampled, and assessed in this and subsequent year. A self-administered questionnaire with 48 questions was distributed to high school in February and March 2005. After one year (February and March 2006), another questionnaire with 10-items was distributed to those students to determine the incidence rate of self-injury. The influence of different factors on self-injury was evaluated with a logistic regression model. Results: The mean age of the subjects was 16.3±0.87 (min 15, max 19) years. At the end of follow–up, 4.8% of pupils reported incidence of self-injury. Most type of incidenced self-injury were cutting and burning. The results of logistic regression model indicate that transition in smoking stages (OR=2.81), incidence of alcohol drinking (OR=2.27) and having smoker friend (OR=1.78) were factors associated with incidence of self-injury. Conclusion: This study showed that incidence rate of self-injury in this group of adolescents was 4.8% in one year, which related to age, alcohol and ciggaret smoking.

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Background and Objective: Periodontal disease has high prevalence in diabetic patients and the knowledge of them about the relationship between diabetes and periodontal disease is effective in the control of the blood glucose and progression of periodontitis. This study was done to evaluate the knowledge, attitude and practice of diabetic patients about periodontal disease in Gorgan north of Iran.
Methods: This descriptive-analytical study was done on 300 type 1 and 2 diabetic patients (136 males & 164 females) whom referred to governmental health centers in Gorgan, northern Iran during 2019. Demographic information, knowledge, attitude and practice were recorded using a questionnaire.
Results: The level of good knowledge, attitude and practice were evaluated 51.7%, 44.3% and 25%, respectively. There was significant association between oral hygiene practice and gender and education (P<0.05). Good practice was observered more in females and in patients.
Conclusion: More than half of diabetic patients had moderate to good knowledge and attitude about periodontal disease but their practice was moderate to poor.