Epidemiology and Determinants of Self-Injury Among High School Students in Iran: a Longitudinal Study.

Non-suicidal self-injury (NSSI) among adolescents is a major health concern globally. The epidemiology and determinant of NSSI have not been studied extensively in Iran. Thus, this longitudinal study sought to investigate the prevalence, incidence and contributing factors of NSSI among adolescents in Iran. This study was conducted at high school students aged 14-18 years old in the metropolitan city of Tabriz, located in north western Iran. Data were collected from 6229 10th-grade students at two time-points, with 12 months interval in October and November 2017 and 2018. A self-administered questionnaire was used to collect information on demographic, NSSI and cigarette and hookah smoking from the study participants. The results showed that lifetime prevalence of NSSI among students was 6.2% (95% confidence interval [CI]: 5.7 to 6.9) at the first assessment. Scratching and hair pulling were the most and least common methods of self-injury, respectively. Over the one year, 206 students (3.6% CI 95%: 3.1-4.1) reported the onset of NSSI. Tobacco smoking and previous year average grade were related to the incidence of NSSI. Although gender was significantly associated with the prevalence of NSSI, the relationship between gender and incidence of NSSI was not significant. Although the prevalence of NSSI was low among adolescents, the incidence rate was considerable. Further studies are required to understand the risk factors of NSSI in Iran.

Relationship between happiness and tobacco smoking among high school students.

OBJECTIVES: Recent research has described negative relationship between happiness and habitual smoking among adolescents. No study of this relationship has been conducted among Iranian adolescents. The aim of the present study was to characterize the relationship between happiness and cigarette or hookah smoking among a sample of high school students. METHODS: A sample of 1,161 10th-grade students in Tabriz (northwest Iran) was selected by multi-stage proportional cluster sampling. Participants completed a self-administered multiple-choice questionnaire including information on cigarette smoking, hookah smoking, happiness score, substance abuse, self-injury, general risk-taking behavior, attitudes towards smoking, socioeconomic information, and demographic characteristics. An ordinal logistic regression model was used for data analysis. RESULTS: It was found that 5.9 and 5.0% of students were regular cigarette smokers and regular hookah smokers, respectively. After controlling for potential confounders, higher happiness scores were found to protect students against more advanced stages of cigarette smoking (odds ratio [OR], 0.98; 95% confidence interval [CI], 0.97 to 0.99; p=0.013). However, no significant relationship was found between happiness scores and hookah smoking status (OR, 1.01; 95% CI, 0.97 to 1.02; p=0.523). CONCLUSIONS: Happiness scores were associated with less advanced stages of habitual cigarette smoking among high school students. Our findings underscore the necessity of conducting longitudinal or interventional studies aiming to determine the effects of enhancing happiness on preventing the transition through the stages of cigarette and hookah smoking.