Table 4. Comparisons of demographic characteristics for successful and failed treatments of methotrexate injection.

	Success (N = 19)	Failure (N = 12)	p-value
Systemic MTX*	16‡	12	0.265
Gestational weeks† (mean ± SD)	8.11 ± 1.82	9.50±2.27	0.070
Initial β-hCG level† (mean ± SD)	39,905.0±47881.0	30,458.4±39,513.9	0.573
Sac size† (mm) (mean ± SD)	31.6 ± 13.4	41.3 ± 13.0	0.040
Positive FHB* (N)	6	5	0.705
Distance between CSP and uterine serosa† (mean± SD)	1.31 ± 2.08	2.83 ± 2.70	0.088

* Chi-Square test

^† Independent t test

^‡ The other 3 patients received MTX local injection into the GS.

FHB: fetal heartbeat, CSP: cesarean scar pregnancy