Table 2.

Negative likelihood ratios (-LRs) for symptoms and signs that decreased the probability of urinary tract infection*

Symptom or signSummary -LR (95% CI)
*Diagnostic terms defined in glossary.
Absence of dysuria0.5 (0.3 to 0.7)
Absence of back pain0.8 (0.7 to 0.9)
History of vaginal discharge0.3 (0.1 to 0.9)
History of vaginal irritation0.2 (0.1 to 0.9)
Vaginal discharge on examination0.7 (0.5 to 0.9)