U.S. Table 20
Impairments Causing Activity Limitation, 1990
| Main Cause | Number of People |
| Orthopedic impairments | 5,873,000 |
| Arthritis | 4,010,000 |
| Heart disease | 3,430,000 |
| Intervertebral disk disorders | 1,762,000 |
| Asthma | 1,710,000 |
| Nervous disorders | 1,560,000 |
| Mental disorders | 1,525,000 |
| Visual impairments | 1,347,000 |
| Mental retardation | 1,069,000 |
| Diabetes | 1,032,000 |
| Hypertension | 837,000 |
| Cerebrovascular disease | 679,000 |
| Hearing impairments | 649,000 |
| Emphysema | 560,000 |
| Osteoporosis/bone disorders | 322,000 |
| All impairments | 33,753,000 |
NOTE: Total of all impairments may be used to compute percentages (e.g., 5,873,000/33,753,000 = 0.174 = 17.4 percent of all impairments that were orthopedic). SOURCE: National Health Interview Survey, 1990. Reported in Disability Statistics Abstract #5: Mitchell P. LaPlante, U.S. Department of Education, National Institute on Disability and Rehabilitation Research.