Table 4. Diagnostic power of vaginal fluid creatinine in subgroup analysis

Vaginal fluid creatinine (mg/dL)	Ruptured membranes	Intact membranes	Accuracy (95% CI)	Sensitivity (95% CI)	Specificity (95% CI)
General (all patients. n=693)
≥0.29	215	16	0.95 (0.94–0.97)	0.93 (0.89–0.96)	0.97 (0.94–0.98)
<0.29	16	446
Closed cervix (n=368)
≥0.29	56	9	0.970 (0.95–0.99)	0.965 (0.88–0.99)	0.971 (0.94–0.99)
<0.29	2	301
Dilated cervix (n=325)
≥0.26	163	10	0.94 (0.91–0.96)	0.94 (0.89–0.97)	0.93 (0.88–0.97)
<0.26	10	142
Urinary incontinence during pregnancy (n=74)
≥0.31	15	4	0.93 (0.85–0.98)	0.94 (0.70–0.99)	0.93 (0.83–0.98)
<0.31	1	54
No urinary incontinence during pregnancy (n=619)
≥0.29	200	12	0.95 (0.93–0.97)	0.93 (0.89–0.96)	0.97 (0.95–0.98)
<0.29	15	392