- 357 COMBINED WEIGHTED OaTa™
100
S0Ta0
T
(BIOLOGICAL AGE SCORES)
T
:
T
T
T
T
o EXPOSED
@ UNEXPOSED
og COMBINED WITH STANDARD
ERROR MEGNS
rs 0.99%"
°
y= 0.51+0.39 1 +0.01 a7
Tor
PERCENT AGING
60
aol
* COEFFICIENT FOR AGE
CORRELATION OF EACH
CRITERIA USED TO WEIGHT
SCORES BEFORE SUMMING
30
20
0
20
Fig. 15.
® © CORRELATION WITH AGE
SIGNIFICANT AT 1% LEVEL
Lt
30
40
|
$0
60
AGE
FIGURE 15
l
790
l
BO
L
90
Biological age scores in exposed and unexposed groups.
"age curve' (Fig. 15) shows that there is less change in the younger
age groups than occur after about age 40, Mean values for exposed and
unexposed are not significantly different.
Discussion
Though the criteria presented in this report show changes which
are definitely correlated with chronological age on a group basis, such
correlation is much less accurate on an individual basis. These tests of
ageing are least useful in the younger age groups (20-40 years of age}, since
most of the criteria either are not present until later or if present show
slight increase during this age period. Therefore, more sensitive tests
are needed to show ageing in these groups,
Effects of radiation on ageing as measured by these parameters
were not detected in this population. Perhaps the tests were not sensitive
enough to detect such effects at the level of radiation exposure sustained.
It is not known if any of the "ageing parameters'' which are ordinarily
associated with senescence are necessarily associated with radiation ageing,
Since the latter is very poorly defined or understood,
Even if they were, it