Table 5. Factors related to a longer hospitalization (≥ 10 days) in 443 elderly women with community-onset non-obstructive acute pyelonephritis caused by Enterobacteriaceae in a final model of multiple logistic regression, 2004 to 2013.

Values are presented as number (%). Final model: autoimmune disorders, bacteremia, CRP ≥ 15 mg/dL of blood, Flank pain. OR, odds ratio; CI, confidence interval; CVAT, costovertebral angle tenderness; UTI Sx, urinary tract infection symptoms; CRP, C-reactive protein; ESBL, extended-spectrum β-lactamase; WBC, white blood cell.

^aUnivariate analysis by the chi-square test or Fisher exact test.

^bMultivariate analysis using logistic regression.

^cDenominators were the number of patients whose data were available in each group.