Table 1.

Description of the studies used in the meta-analysis of accuracy of serum progesterone measurement in diagnosing pregnancy failure (PF, consisting of ectopic pregnancy $\left(EP\right)$ and nonviable intra-uterine pregnancy (nv-IUP)) versus viable intra-uterine pregnancy (v-IUP).

Studya	Study design	# categories	# patients	Pregnancy failure		v-IUP
				EP	nv-IUP
Gelder et al.(1991)	retro.	5	126	46	26	54
Grosskinsky et al.(1993)	retro.	5	95	11	54	30
Hahlin et al.(1991)	prosp.	2	307	159	75	73
Ledger et al.(1994)	prosp.	5	180	38	108	34
Mesprogli et al.(1988)	prosp.	2	139	70	30	39
Peterson et al.(1992)	prosp.	5	79	42	21	16
Riss et al.(1989)	prosp.	5	71	14	34	23
Stewart et al.(1995)	retro.	4	61	14	23	24
McCord et al.(1996)	retro.	4	3254	410	1418	1426
Stern et al.(1993)	prosp.	5	338	15	81	242
Al Sebai et al.(1995)	prosp.	2	479	35	175	269
Hubinont et al.(1987)	prosp.	2	662	11	73	578
Witt et al.(1990)	retro.	5	221	32	58	131
Williams et al.(1992)	retro.	5	174	51	74	49
Darai et al.(1996)	prosp.	2	104	30	22	52
Jouppila et al.(1980)	retro.	2	188	8	87	93
Isaacs et al.(1994)	prosp.	4	116	—— 49 ——		67
Daily et al.(1994)	prosp.	7	74	—— 16 ——		58
Lower and Yovich (1992)	prosp.	4	384	—— 124 ——		260
Stovall et al.(1989)	prosp.	2	582	—— 195 ——		387

^aFor complete list of references, see Mol et al., 1998.