(40 ILCS 5/15-124)
(from Ch. 108 1/2, par. 15-124)
"Actuarial tables": Such tabular listings of assumed rates of decrement
such as death, disability, retirement and withdrawal from service,
according to age and sex, including mathematical functions derived from the
rates of probability, combined with an interest discount factor, as are
adopted by the board based upon the experience of the system.
(Source: Laws 1963, p. 161.)