Disability Type	Age 3-5 Years	Age 6-11 Years	Age 12-17 Years	Age 18-21 Years
Specific Learning Disabilities	14,972	1,028,083	1,681,532	136,520
Speech Or Language Impairments	307,597	946,802	131,938	5,010
Mental Retardation	23,777	216,781	309,227	66,416
Emotional Disturbance	7,000	156,194	294,618	25,344
Multiple Disabilities	9,386	55,043	55,951	16,006
Hearing Impairments	7,361	32,559	33,054	4,632
Orthopedic Impairments	9,966	36,649	31,706	4,951
Other Health Impairments	13,606	154,734	171,041	10,785
Visual Impairments	3,170	11,813	11,525	1,958
Autism	16,854	63,363	28,390	5,576
Deaf/Blindness	213	644	676	253
Traumatic Brain Injury	965	7,710	10,921	2,062
Developmental Delay	197,217	44,867	NA	NA
Total	612,084	2,755,242	2,760,579	279,513

Note: "NA" indicates data not applicable.

Data in this table include populations from the 50 states and the District of Columbia.
In order to use the category of Developmental Delay for reporting, states had to have defined and established eligibility criteria for Developmental Delay. Of States using the Developmental Delay category, only people age 3-9 years were included.

To calculate the percent of people in a certain age group who were served for a specific disability type, divide the number served in the age group for the specific disability type by the total number of people served in that age group and multiply the result by 100. Example: Of people age 3-5 years who were served, calculate the number served for Autism. This calculation would be: 16,854/612,084=.028 and .028x100=2.8%

Source: Office of Special Education Programs (OSEP), Data Tables for OSEP State Reported Data, IDEA Part B Child Count 2001-2002.