Association of Matrix Metalloproteinase 9 (MMP-9) Polymorphisms with Asthma Risk: A Meta-Analysis

Table 1

Characteristics of the studies included in the meta-analysis.

First author	Year	Country	Ethnicity	Case	Control	Age group	Genotyping method	NOS score
Holla LI	2000	Czech	Caucasian	59	79	Adult	PCR-SSCP	7
Ganter	2005	Germany	Caucasian	231	269	Children	PCR-RFLP	7
Lose	2005	Australian	Caucasian	514	392	Adult	PCR-RFLP	8
Erbek	2009	Turkey	Unknown	30	115	Adult	PCR-RFLP	6
Zhu	2012	China	Asian	65	68	Children	PCR-RFLP	7
Nakashima	2006	Japan	Asian	290	638	Children	Sequenced	8
Jimenez-Morales	2013	Mexico	Hispanic Latino	403	426	Children	TaqMan	9