c - usaid

11
This formula enables us to estimate, with a reasonable
degree of accuracy, the contraceptive prevalence ate that needs
to be attained in the target year for achlcvIng a given TFR
target. To faci li tate practical applications, tile TARGET"
program of the Popu lation Counci L assume that TF [ t) TF(0 .
In the a ga-speci fic version, simi Lar formulas are a ppli d
separately to each five-yearly age-group except that the total
ferti lity rate a nd the totat abortion rate are replaced by their
age-specific aquivalents. Without going into detail we write
below the age-specific equivalent to formula (2.8], using the
letter a to refer to each ago-group ranging from 15-19 to
45-49:-.
I ASFR[t,a) 1
u(t,a) =------------- I- x--------- x
SCF(a] e(t,a) ASFR(O,a) F(t,a)
( I - SCF(a) x u (D,a) x a [Oa] 11 ... 2.9]
where SCF standa for age-specific sterility correction factor.
Values of this factor, ranging from 1.02 (for age 15-19) to 2.08
(for age 45-49) have already been shown above.