Sensitivity and specificity of the decision rule in the whole validation population and in the subgroup of children for whom urines were collected using suprapubic aspiration, urethral catheterization or clean-voided midstream sample.

Values are expressed as values or % (95% CI).
Discriminative values were compared using a χ2 test for unpaired sample.
*Subgroup of children for who urines were collected using suprapubic aspiration or urethral catheterization.
**Adjusted OR were calculated with the multi-level logistic regression models.
Abbreviations: NPV, Negative predictive value; OR, Odd ratio; PCT, Procalcitonin; PPV, Positive predictive value.