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. 2020 Apr 16;8(4):e17366. doi: 10.2196/17366

Table 4.

Classification according to the incidence of ectopic pregnancy (n=1703).

Group	Predicted probability	n (%)	Incidence of EP^a (%)	Number of actual cases
				IUP^b	EP	BCP^c
1: EP low risk	Prob_EP<0.1 & Prob_BCP<0.5	1460 (85.73)	0.52 (0.23-1.03)	1453	7	0
2: predicted BCP	Prob_BCP≥0.5	52 (3.05)	5.79 (1.21-15.95)	2	3	47
3: gray zone	0.1≤Prob_EP<0.5 & Prob_BCP<0.5	152 (8.93)	28.32 (21.10-35.53)	108	43	1
4: EP high risk	Prob_EP≥0.5	39 (2.29)	64.11 (47.22-78.81)	13	25	1

^aEP: ectopic pregnancy.

^bIUP: intrauterine pregnancy

^cBCP: biochemical pregnancy.