Association between Polymorphism of Interleukin-1beta and Interleukin-1 Receptor Antagonist Gene and Asthma Risk: A Meta-Analysis

Table 2

Main data of all studies included in the meta-analysis for the polymorphism in IL-1RA gene.

Reference, year	Ethnicity	Source of control	Mean of age (years)	Cases/control	Cases			Control
	(country)				GG	GA	AA	GG	GA	AA
Birbian et al. 2013 [37]	Asian (India)	PB	38.1	815/825	593	214	8	653	162	10
Hang et al. 2003 [35]	Asian (Taiwan)	HB	27.4	115/47	101	12	2	39	8	0
Lim et al. 2011 [28]	Asian (Singapore)	HB	63.5	294/710	251	40	3	621	89	0
Mahdaviani et al. 2009 [30]	Caucasian (Iran)	HB	17.9	37/140	35	2	0	80	56	4
Pattaro et al. 2006 [34]	Caucasian (Germany)	PB	23.6	604/905	356	207	41	538	315	52
Pillay et al. 2000 [36]	Caucasian (African)	PB	26	149/209	119	26	4	165	41	3
Ramadas et al. 2007 [33]	Caucasian (USA)	PB	10	419/3057	242	142	35	1721	1150	186
Rezaei et al. 2009 [29]	Caucasian (Iran)	PB	6.5	29/140	15	12	2	80	56	4
Settin et al. 2008 [32]	Caucasian (Egypt)	HB	7.5	70/98	63	6	1	57	41	0
Zeyrek et al. 2008 [31]	Caucasian (Turkey)	PB	9.4	268/228	54	168	46	66	136	26

HB: hospital-based case-control; PB: population-based case-control.