Table 1.

Characteristics of the studies involving an association between the MIF-173G/C polymorphism and PTB risk included in the meta-analysis.

Author	Year	Coutry	Ethnicity	P1/C2	Age	HIV	Case			Control			Method	Score
							CC	CG	GG	CC	CG	GG
Gomez LM20	2007	Colombia	Caucasian	230/235	40 ± 16/43 ± 16	No	15	95	120	16	86	133	PCR-Sequencing	7
Hashemi M21	2015	Iran	Caucasian	161/142	50.6 ± 20.5/47.3 ± 15.4	NR	9	53	99	5	32	105	PCR-RFLP4	8
Kuai SG23	2015	China	Asian	47/50	NR3	NR	25		22	16		34	PCR-RFLP	7
Li Y19	2012	China	Asian	215/245	43.8 ± 5.76/40.2 ± 4.90	NR	32	74	109	16	61	168	PCR-RFLP	7
Liu AH27	2015	China	Asian	200/100	40.56 ± 17.39/38.65 ± 9.15	NR	4	116	80	6	37	57	PCR-RFLP	6
Sadki K18	2010	Morocco	Caucasian	123/154	33.30 ± 13.09/32.89 ± 11.20	No	21	45	57	9	63	82	RT-PCR5	7

¹patient; ²control; ³not report; ⁴polymerase chain reaction-restriction fragment length polymorphism; ⁵real time-polymerase chain reaction.