Table 1.
Characteristics of Pregnant Women With Discordant Syphilis Serologya According to Treponema pallidum Particle Agglutination Assay Status (N = 194)
| Characteristic | CIA+RPR−TP-PA+ (n = 38) | CIA+RPR−TP-PA– (n = 156) | P Value |
|---|---|---|---|
| Age at delivery, y, mean (SD) | 35 (5.1) | 30 (5.9) | <.0001 |
| Prior pregnancies, median | 4 | 2 | <.0001 |
| Living children, median | 2 | 1 | .001 |
| HIV status, No. (%) | |||
| Positive | 1 (3) | 0 | |
| Negative | 37 (97) | 156 (100) | |
| STI (not syphilis) in past 24 mo, No. (%) | 6 (16) | 4 (3) | .005 |
| Prior history of syphilis, No. (%) | 26 (70) | 3 (2) | <.0001 |
Abbreviations: CIA, chemiluminescence immunoassay; HIV, human immunodeficiency virus; RPR, rapid plasma reagin test; SD, standard deviation; STI, sexually transmitted infection (includes chlamydia, gonorrhea, and genital herpes); TP-PA, Treponema pallidum particle agglutination assay.
a CIA reactive, RPR nonreactive.