1 / 16

Fertility Measures & Concepts

Fertility Measures & Concepts. Complexities of Fertility Analysis. Involves 2 individuals of opposite sex Risk is not universal in female population Fecundity Sexual activity Contraception/abortion Repeatable event. Crude Birth Rate.

toki
Download Presentation

Fertility Measures & Concepts

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fertility Measures & Concepts

  2. Complexities of Fertility Analysis • Involves 2 individuals of opposite sex • Risk is not universal in female population • Fecundity • Sexual activity • Contraception/abortion • Repeatable event

  3. Crude Birth Rate • The CBR is often multiplied by 1,000 and expressed per 1,000 in the population • The CBR of Malawi from 1985-90 was 56.3 Births in the period 0 to T CBR = Person-yrs lived 0 to T (mid-year population)

  4. General Fertility Rate • The GFR is also often multiplied by 1,000 and expressed per 1,000 in the population Births in the period 0 to T GFR = Person-yrs lived 0 to T by women ages 15-50 (mid-year population)

  5. Age-Specific Fertility Rates Births in the period 0 to T towomen aged x to x+n ASFR = Person-yrs lived 0 to T by women aged x to x+n

  6. Total Fertility Rate • Sum of all age specific fertility rates

  7. Variants of TFR • Parity specific fertility rates • Women at parity “p” • Marital fertility rates • Married women

  8. Cohort Fertility • The mean parity for a cohort of women who have completed their fertility is that cohort’s TFR

  9. Parity Progression Ratio • Proportion of a cohort who had at least i live births who went on to have at least one more • Box 5.4 (p. 105) Number of women at parity i+1 or more PPR= Number of women at parity i or more

  10. Reproduction Measures • Gross Reproduction Rate (GRR) • The number of female births an average woman would have if she lived through the end of her reproductive span. • Net Reproduction Rate (NRR) • The average number of daughters that female members of a birth cohort would bear during their reproductive life span if they were subject to the observed age-specific maternity rates and mortality rates through their lifetimes. • NRR=1 equals exact replacement fertility

  11. Why are high birth rates so low?

  12. Proximate Determinants of Fertility • Marriage & Marital Disruption • Sterility • Postpartum Infecundability • Fecundability • Spontaneous Intrauterine Mortality • Contraception • Induced Abortion

More Related