Number of assessments showing abnormality
| Patient group | Number of assessments | ||||
|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 2/3 | |
| SN | 12 | 14 | 6 | 0 | 6 |
| SP | 9 | 15 | 7 | 0 | 7 |
| AIDS | 12 | 23 | 19 | 7 | 262-150 |
↵2-150 Different from SN.
Criteria: MRI—any abnormality on visual rating; neurology—abnormality on clinical examination indicative of CNS change; neuropsychology—mean z ⩽−0.5, or ⩾6 tests with individual z scores ⩽0.5 if less than all tests completed.
BL=potential blood donors; SN=seronegative homosexual men; SP=seropositive homosexual men; AIDS=symptomatic or immunosuppressed patients.