(40 ILCS 5/15-124) (from Ch. 108 1/2, par. 15-124)
    Sec. 15-124. Actuarial tables.
    "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.)