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60
slowly going down duo to rising ago at marriage;
(iii] TFR trgot and overall CPR needed to achieve that target as
estimated from tho aggregate model ( in BLock 2) ;
(iv)
Sterility corroction factors for five-yearly ago-groups.
Theoretically, theo factors, together with the underlying
natural forti Li ty p attern (if it is differont from the
Coale-Trussall pattorn) shou Ld be checked for consistency
with the overall sterility correction factor. Our
cal;uLations with the four patterns give the following
roeults:-
Stori li ty Overall stori l i t correction factor
correction corresponding to naturaL ferti Iity
Age-g roup factor patterns
--------------------- ---------- -----------------------------------
I II III IV
15-19 1.02
20-24 1.02 1.08 1.09 1.09 1.07
25-29 1.03
30-34 1.04
35-39 1.12
40-44 1.33
-45-49 2.08
Since thee calculations do not reveal much variation
among--'
the four patterns, the values of the overall as well as agospecific
factors suggested by the Population Council can be
taken for the base year as well as the target years;
v] Use-effectivenes of contraceptive methods for five-yearly
agO-groups. Starting from tho base year values of Uo
effectiveness, which Lie between 0.83 and 0.85, the target
y a a r v a tu us c an b e a a a urm a d to b a r i si ng a L ow L y t i LI theo y