نسبت های جنسی در گروههای مختلف سنی در ایران

Present paper is a report on the ratios in different age group of Iranians. In this investigation unlike the former reports, insteed of sampling, we considered the total Iranian population. We calculated  the secondary sex ratios in Iranians according to their residential conditions (urbans, rurals and nomads) and age group. Age group in this study were arranged in 5 year periods , and primary data was obtained from results of official records of 1991. Based on noted data, total population of Iran in 1991 was 55,837,136. Total sex was 106.27, and it was 106.71 in urbans, 105.68 in rurala and 107.19 in nomads, sex ratio in all age group, with some exceptions was heigher than 100, which means in almost al age group, population of males was more than that of females. Sec ratios in lower age groups up to 20 years old, was more than age groups between 20 to 45 years old, showing increased mortality in lower age group among females. Results showed that the sex ratios in different areas are significantly heigh in age group above 55 yeas, which means the number of the men in heigher than that of aged women.