641—203.6 (135) Bed need formula for mentally retarded.
	 203.6(1) Age—ten years to sixty-five years. It was determined that services for mentally retarded under age 10 would in most cases be met in the home and that in many cases not identified until approximately that age. For age 65 and older, the services needed would in most cases be similar to those of geriatric needs.
	 203.6(2) Levels of retardation in population.

a. Mildly retarded	2.6%	
b. Moderately retarded	.3%	
c. Severely and profoundly retarded	.1%	
% of mentally retarded in total population	3%	
90% of “c” need services outside of home
50% of “b” need services outside of home
0% of “a” need services outside of home
	 203.6(3) Formula.
.1% (90%) = .09
.3% (50%) = .15
.24 ÷ .03 = 8%
(8% of mentally retarded population need services outside of home)
8% of mentally retarded population = number of ICF/RCF beds
20% of all beds = ICF/MR beds at state-operated institution
30% of all beds = ICF/MR community-based facilities
50% of all beds = residential type services for all types of facilities.