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

Table 1

Main data of all studies included in the meta-analysis for the -511C/T polymorphism in IL-1β gene.

Reference, year	Ethnicity	Source of control	Mean of age (years)	Cases/control	Cases			Control
	(country)				TT	TC	CC	TT	TC	CC
Hang et al. 2003 [35]	Asian (Taiwan)	HB	27.4	116/47	40	54	22	18	22	7
Hsieh et al. 2004 [40]	Asian (Taiwan)	HB	10	202/144	69	93	40	48	70	26
Karjalainen et al. 2003 [38]	Caucasian (Finland)	PB	58	99/98	37	45	17	42	41	15
Lim et al. 2011 [28]	Asian (Singapore)	HB	63.5	299/716	83	155	61	200	359	157
Mahdaviani et al. 2009 [30]	Caucasian (Iran)	HB	17.9	40/140	6	52	2	36	82	21
Karjalainen et al. 2002 [39]	Caucasian (Finland)	PB	57.7	200/200	84	82	34	69	102	29
Rezaei et al. 2009 [29]	Caucasian (Iran)	PB	8.6	30/280	8	21	1	72	166	42
Wu et al. 2007 [41]	Asian (China)	HB	39.5	76/76	24	36	16	26	38	12
Zeyrek et al. 2008 [31]	Caucasian (Turkey)	PB	9.4	268/228	54	168	46	66	136	26
Zhao et al. 2006 [42]	Asian (China)	HB	5.9	55/35	4	51	0	5	30	0

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