Table 3.
Serological Results at the Time of Diagnosis According to HIV Status
| Baseline | HIV Positive (n = 112) | HIV Negative (n = 152) | Total (N = 264) | P Valuea |
|---|---|---|---|---|
| VDRL | ||||
| Median titer | 1:32 | 1:16 | 1:32 | .001 |
| Interquartile range | 1:8–1:64 | 1:3–1:64 | 1:4–1:64 | |
| Negative, No. (%) | 12 (11) | 30 (20) | 42 (16) | NS |
| TPPA | ||||
| Median titer | 1:20 480 | 1: 5120 | 1:10 240 | .002 |
| Interquartile range | 1: 2560–1:81 920 | 1: 640–1:40 960 | 1: 1280–1:40 960 | |
| Negative, No (%) | 2 (2) | 4 (3) | 6 (2) | NS |
| Pathozyme-IgM | ||||
| Median titer | 3.42 | >3.50 | >3.50 | NS |
| Interquartile range | 1.52 to >3.50 | 1.87 to >3.50 | 1.71 to >3.50 | |
| Negative, No. (%) | 16 (14) | 10 (7) | 26 (10) | NS |
Abbreviations: IgM, immunoglobulin M; NS, not significant; TPPA, Treponema pallidum particle agglutination test; VDRL, Venereal Disease Research Laboratory test.
a Mann-Whitney test for median titers and Fisher exact test for number of negatives.