Journal of School of Public Health and

We performed a cross sectional study with the aim of assessing levels of habitual physical activity and associated factors (barriers and motivators), finding the stage of change among high school girls, and exploring relationships between physical activity and the following set of factors: age, parent education, type of school attended, knowledge, and attitude. 457 girls in the 1SI to 3rd grade of high school with a mean age of 15.6 (%95.3 cases were 14th to below 17Ih years old) in Tehran&aposs second region of educational office district were selected via proportional-to-size and cluster sampling methods. These girls attended 4 different types of facilities (public and private high schools / public and private vocational schools). The data were gathered through self-administered questionnaires. Our results indicated that %58.6 of students were in pre-contemplation and contemplation stages, while 24.7% were in action and maintenance stages of change.
The mean level of physical activity at work (in school) was 2.22, which was significantly lower than 2.75- the minimum acceptable level of physical activity at work (p<0.00 ). The mean level of sport activity was 2.73, significantly (p<0.001) higher than 2.33 (minimum acceptable level of sport activity). The mean level of physical activity at leisure time was 2.50, which had no significant difference with the minimum acceptable level of 2.50. (Note: all max. acceptable level is 5).
The most important barriers identified were: time constraints, lack of companions, lack of suitably located facilities and a general state of lassitude.
The most important motivators were individual interest, desire to lose weight, company of friends, and support of parents. The level of exercise did not show a significant relationship with age, probably because of the limited range of age categories enrolled in this study. Levels of physical activity at work and sport activity (p=0.004 for ph.act.work and p=0.012 for sport) showed a significant positive relationship with the mother&aposs level of education. No significant relationships were found between any type of physical activity and the father&aposs education. The level of sport activity in private high schools was significantly (p=0.005) higher than in public high schools. On the other hand no significant differences were observed between levels of physical activity in private or public high schools compared to private or public vocational schools. Only sport activity had a significant positive relationship with higher knowledge (p=0.005) and attitude (pO.OOl).
The majority of our population (%58.6) was in pre-cont. and cont. level of stage of change. Therefore more emphasis should be placed on improving health education. We must also teach our teenagers to organize their leisure time so they can do some simple and inexpensive physical activities like brisk walking between home and school or while shopping.

Background and Aim: The purpose of this study was to compare the two techniques of fault tree analysis (FTA) and Tripod-Beta using the analytic hierrarchy process (AHP) for choosing the preferred technique to be used in the analysis of grave accidents in a steel-manufacturing company.

Materials and Methods: This research project was carried out in three main phases.  In the first phase two disastrous accidents were sketched for analysis and, using the two techniques of FTA and Tripod-Beta, the causes for their occurrence were determined. In the second phase 7 criteria were chosen for comparing the two techniques. Finally, in the third phase, the two techniques were compared on the basis of chosen criteria, using AHP.

Results: The findings showed that the criterion for the number of accidents' agents with a priority of 0.435 had the highest priority, followed by quantitative ability, cost of analysis, time spending, and software need with a priority of  0.07,  0.059,  0.038,  and 0.036, respectively.

Conclusion: Considering all the chosen criteria, it can be concluded that the fault free analysis technique with a priority of 0.624 is superior to Tripod Beta technique with priority a priority of 0.35.