Table 4. A prediction of treatment success by using pretreatment serum hCG titer.

	Single-dose	Multi-dose
Serum hCG level cutoff (IU/L)	≤3,026	≤3,711
AUC (95% CI)	0.766 (0.630–0.871)	0.749 (0.565–0.884)
Sensitivity	64.7	56.5
Specificity	84.2	100
Positive likelihood ratio	4.10	-
Negative likelihood ratio	0.42	0.43
Positive predictive value	88.0	100
Negative predictive value	57.1	47.4
Treatment success rate according to serum hCG level (IU/L)
≤3,026	86.9% (20/23)	100% (8/8)
>3,026 to ≤3,711	25.0% (1/4)	71.4% (5/7)
>3,711	50.0% (13/26)	58.8% (10/17)

hCG, human chorionic gonadotropin; AUC, area under the curve; CI, confidence interval.