Explanation of variable:
IF AVAILABLE, What type of VIRAL ASSAY was used for this measurement?
| 10 | Roche 1.0 |
| 15 | Roche 1.5 ultra-sensitive |
| 19 | Any Roche (unspecified) |
| 20 | NASBA |
| 21 | NASBA ultra-sensitive |
| 29 | Any NASBA (unspecified) |
| 31 | Chiron b-DNA 1.0 |
| 32 | Chiron b-DNA 2.0 |
| 33 | Chiron b-DNA 3.0 |
| 39 | Any Chiron (unspecified) |
| 40 | Abbott ultra-sensitive |
| 41 | Abbott LCx |
| 42 | Abbott RealTime HIV-1 m2000 |
| 5 | Roche TaqMan |
| 50 | Monitor 1.0 |
| 51 | Monitor 1.0 ultra-sensitive |
| 55 | Monitor 1.5 |
| 56 | Monitor 1.5 ultra-sensitive |
| 59 | Monitor unspecified |
| 65 | Cobas 1.5 |
| 66 | Cobas 1.5 ultra-sensitive |
| 90 | Other |
| 99 | Unknown |