Relationship Between Physical Activity and Family Size with Index of BMI - for - Age in Iran Girl Guidance Schools, 2010-2011

There is no information in the field of nutritional status in middle schools adolescents' in South of Iran (Kish Island), therefore, this study was performed in Kish Island girl's middle schools to determine association body mass index (BMI) with physical activity and family size. In a crosssectional descriptive analytic study and without sampling were studied 488 girls from all Middle schools Kish Island. Measuring height, weight and body mass index calculation was determined by anthropometric questionnaire. Nutritional status of girl's middle schools was defined by the BMI index for age based on the reference CDC2000. Results also showed that there was a significant difference (P < 0.03) between the mean of physical activity among underweight natural overweight and obesity groups. On the other hand, the girls who lived in crowded households (more than 4 people) were underweight and the percentage of obesity and overweight in people with higher family size was much lower than other groups. This study showed, there is a relationship between BMI with physical activity and family members and this relationship is negative in both cases.