Background & Aim: This study aimed to assess relationship between perceived benefits/barriers and decisional balance with stages of change for physical activity among high school students in Bandar Abbas, Iran.

Methods & Materials: This cross-sectional study was conducted in high schools of Bandar Abbas, in the south of Iran. A total of 422 high school students were selected. Twenty two participants did not fill out questionnaires completely. A total of 400 questionnaires were analyzed (response rate=94.8%). The perceived benefits/ barriers to exercise and decisional balance were assessed using the Exercise Benefits/Barriers Scale and stages of change were assessed using the Physical Activity staging. Data were analyzed in the SPSS v.16.

Results: The mean age of the participants was 15.9 (SD=1.1) ranging from 14 to 18 years. More than half of the participants (51.8%) were male and 48.2% were female. About half of the participants (49.2%) were engaged in regular physical activities. Fifteen per cent of the participants in the precontemplation stage, 15.8% in the contemplation stage, 20% in preparation stage, 15.8% in action stage, and 33.4% in maintenance stage for physical activity. From precontemplation stage to maintenance stage, the perceived benefits and decisional balance were increased and the perceived barriers was decreased.

Conclusion: The results of this study are in line with the Transtheoretical model. This model can be used as a framework to design interventions for improving physical activity in population.

Background & Aim: Fertility is the most important factors affecting population fluctuations. Reproductive behaviors of a community can be studied through different methods. One of the methods is the evaluation of the interval between marriage and the birth of the first child. The aim of this study was to investigate the factors influencing the interval between marriage and first birth using the Cox regression model.

Methods & Materials: In this study, 1230 first-time mothers referred to urban and rural health centers of the city of Bandar Abbas were selected and studied in 2012-2013. The Cox regression model (proportional hazard) was performed to investigate the interval between marriage and first birth and the factors influencing this interval. Descriptive analysis of data was performed using SPSS software version 22 and data modeling was performed by R software version 3.2.1.

Results: In this study, the mean interval between marriage and first birth was 27.63 (±24.35) months. Based on the Cox model, mother’s age at marriage with HR(Hazard-Ratio)=1.13 (1.01–1.25) and place of residence with HR=1.28 (1.12–1.46) had significant effects on the interval between marriage and first birth.

Conclusion: The results of the current study compared to previous studies show that the interval between marriage and first birth has decreased, and some changes are observed in the factors influencing this interval.