Journal of School of Public Health and

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Background and Aim: There is evidence that physical activity declines during adolescence in Western countries. However, this pattern has not yet been shown in Iranian youth. The purpose of this study was to detect changes in physical activity behaviors, psychological factors (including perceived benefits, barriers, and self-efficacy), and interpersonal influences associated with exercise behavior during the transition from secondary school to high school in Sanandaj, Iran.
Materials and Methods: The data on a group of high school students in Sanadaj were collected in a cross-sectional study in 2006, with a follow-up in 2009. The study population in 2009 included 844 students (51% males and 49% females) with a mean age of 16.42 ± 1.73 years. Data on physical activity-related perceived benefits, barriers, self-efficacy, and interpersonal influences, as well as physical activity behavior, was collected, using self-reporting questionnaires. The SPSS-16 software was used for data analysis.
Results: The test of time effects indicated significant differences between the 2 sexes as regards physical activity and most of the psychological variables and interpersonal influences associated with exercise activities. The girls had less physical activity than boys at both time points. The duration of moderate physical activity at the first time point was 31.82 and 53.75 minutes for girls and boys, respectively the corresponding values at the follow-up were 23.7 and 44.7 minutes. Girls had lower self-efficacy and fewer perceived benefits and more perceived barriers for physical activity over time. The correlation test indicated more stability of family interpersonal influences for girls than for boys.
Conclusion: The results of this study provide evidence for decreased physical activity in boys and girls and sex differences in cognitive variables and interpersonal influences.

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Background and Aim: The incidence of breast cancer in women is expected to rise sharply over the coming decades in Iran. The aim of this study was to determine risk factors for breast cancer in under-50-year-old women during the period 2013-2015 in Kermanshah, Iran.

Materials and Methods: This case-control study was carried out in Imam Reza Hospital and private clinics of oncologists (three clinics) in Kermanshah, Iran. The participants were 202 patients with breast cancer and 398 without breast cancer. Subjects of the experiment group were selected from among patients in the Departments of Oncology, Radiation Therapy, and Chemotherapy of the hospital, while the control group subjects were selected from among outpatients referred to specialty and subspecialty departments and private clinics of the hospital (outpatient, oncology, gynecology, ophthalmology, sonography, ENT, infertility). The two groups were matched for age. Data were collected by interviewing the subjects, the Gill standard questionnaire and the patients’ files and analyzed using the STATA software (version 12) ─ Odds Ratio (OR), 95% Confidence Interval (CI) and the Conditional logistic regression model.

Result: The following variables were found to be the most important risk factors for breast cancer among under-50-Year-old women: a family history of breast cancer in second degree relatives, an age of 18-35 years at the first childbirth, and a history of a benign breast lump.  

Conclusion: It is recommended to conduct further studies on the subject with due consideration of other risk factors for breast cancer, as well as education of women about breast self-examination  and importance of periodic clinical examinations.