# 8 STEPS IN THE CONSTRUCTION OF AN AGE SEX PYRAMID

• Establish the number of cohorts in the population.
• Determine the number or percentage of males and females in each cohort. Using the number of males and females in the cohorts, choose an appropriate horizontal scale. For example, 1 cm rep 500 000.

• Choose an appropriate vertical scale as determined by the total number of cohorts. Each cohort is represented by a bar. The bars should neither be too wide nor too narrow. In our case the scale is 1 cm represents 1 cohort.
• Draw two vertical lined at the centre of a graph paper with 2 cm space between them. At the base of each draw horizontal lines away.
• In the 2 cm space, indicate the cohorts beginning with the lowest age group in ascending order.
• Mark the values on the horizontal lines appropriately. Then mark age groups (cohorts) to the right to represent females and to the left to represent males.

• Draw respective bars in each cohort and shade them neatly.
• Frame the age-sex pyramid and give it a title

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