Online course on data analysis and report writing for civil registration based vital statistics 12 July to 10 September 2021 1 Patterns of childbearing are different by age These patterns have many drivers ID: 933007
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Slide1
Module 5
Age-specific fertility rates
Online course on data analysis and report writing for civil registration based vital statistics
12 July to 10 September 2021
1
Slide2Patterns of child-bearing are different by ageThese patterns have many drivers: Availability of family planningCultural & Societal normsCosts of raising children
Value of education
Slide3Distribution of births by age of motherExample from Fiji Vital Statistics report 2012-2017:
Slide4Age-specific fertility ratesAge-specific fertility rates (ASFRs) are the number of births occurring to mothers of a certain age group per 1,000 women in that age group in a given period of time. ASFR's are usually calculated for women aged 15-49 in each 5-year age group. The advantage of ASFRs is that they are not affected by differences in the age distribution among women of childbearing ages.
Slide5Age-specific fertility rates - CALCULATIONS
Slide6Question:
Age groupASFRs
Country A
Country B
15-1970.3
27.2420-24203.3135.5
25-29
193.3207.430-34136.8
18935-3960.2
106.940-4422.348.9
45-49
1.4
15.5
Which country has higher fertility?
Age group
ASFRs
Country A
Country B
15-19
70.3
27.2
20-24
203.3
135.5
25-29193.3207.430-34136.8189.035-3960.2106.940-4422.348.945-491.415.5
Bad table example
Good table example
Slide7AnswerAge group
ASFRs
Country A
Country B
15-1970.3
27.220-24203.3135.5
25-29
193.3207.430-34136.8
189.035-3960.2
106.940-4422.348.9
45-49
1.4
15.5
Total
687.6
730.4
ASFRs are not affected by population structure. Higher ASFRs = higher fertility
Slide8ASFRs follow a standard patternASFRs start from zero at very young ages where women are not yet able to bear children,
Rise until they peak sometime in women’s twenties.
Decline back to zero somewhere around 50 years of age.
Variations in the pattern occur due to factors such as age at marriage, the prevalence of contraceptive use, etc.
Slide9ASFR Comparisons across 5 countries
Source: U.S. Census Bureau’s International Data Base
Slide10ASFRs in Mexico over Time
Source: U.S. Census Bureau’s International Data Base
Slide11Total fertility rate (TFR)TFR = (Sum of ASFR x 5 ) / 1,000ASFRs are good for representing fertility by age group, but difficult to use if:
Comparing two different populationsExamining a given population over time
Furthermore, they are not an easily understood measure of fertility. We therefore usually talk about the total fertility rate (TFR), when discussing fertility.The TFR is the average number of children a woman would give birth to during her lifetime if she were to pass through her childbearing years experiencing the present-day age-specific fertility rates
The TFR (for 5 year ASFRs) is calculated by adding up the age-specific fertility rates, multiplying this sum by 5 and dividing by 1,000
Slide12Calculating TFR - EXAMPLE
Slide13ASFRs with aggregated dataExampleAverage number of births from 2007-2011 was 55 for women aged 20-24Midpoint is July 1, 2009. There were 300 women aged 20-24 on this date.
ASFR of 20-24 year olds = (55/300)*1000 = 183.3 for the period 2007-2011
x 1000
Slide14Teenage fertility rateThe teenage fertility rate, or adolescent birth rate, refers to the number of births in a given period of time to females aged 15–19, divided by the number of all 15 – 19 year old females at the period midpoint.
Equal to the ASFR for 15-19 year olds.
Relevance to SDGsAdolescent birth rates are a key indicator in measuring the progress of SDG Goal 3: “By 2030, reduce the global maternal mortality ratio to less than 70 per 100,000 live births”.
In the PacificAdolescent births rates in 2007 were 61.3 for the Pacific Region, 48.3 for the world, 52.3 for developing regions, and 23 for developed regions
Slide15Assignment Calculate: Age specific fertility rates (ASFR)Total fertility rate (TFR)2. Write a short paragraph to explain the ASFR and the TFR of your country