Which statement correctly defines the scope of age-specific fertility rate (ASFR)?

Which statement correctly defines the scope of age-specific fertility rate (ASFR)?

• A. It measures births per 1000 women in a given age group in a year
• B. It measures births per 1000 population
• C. It measures total births in a year
• D. It measures mean births per woman over a lifetime

Answer: (A)

Age-specific fertility rate measures how many births occur to women in a specific age group during a given year, expressed per 1,000 women in that age group. This lets you compare fertility patterns across ages and over time. It’s not about births per the whole population, nor about total births in a year, and it’s not predicting lifetime births for a woman (the total fertility rate does that). For example, if 5,000 births happen to women aged 20–24 in a year and there are 100,000 women in that age group, the ASFR is (5,000 / 100,000) × 1,000 = 50 births per 1,000 women in that age group.

Age-specific fertility rate measures how many births occur to women in a specific age group during a given year, expressed per 1,000 women in that age group. This lets you compare fertility patterns across ages and over time. It’s not about births per the whole population, nor about total births in a year, and it’s not predicting lifetime births for a woman (the total fertility rate does that). For example, if 5,000 births happen to women aged 20–24 in a year and there are 100,000 women in that age group, the ASFR is (5,000 / 100,000) × 1,000 = 50 births per 1,000 women in that age group.