Table 1.

Characteristics of case-control studies included in the full meta-analysis

Study (first-named author)	Country	−592				−819				−1082
		Genotype for cases		Genotype for controls		Genotype for cases		Genotype for controls		Genotype for cases		Genotype for controls
CC + CA	AA	CC + CA	AA	CC + CT	TT	CC + CT	TT	GG	GG + AA	GG	GA + AA
Afzal [23]	Pakistan	–	–	–	–	73	16	84	15	15	74	3*	96
Dogra [25]	India	–	–	–	–	–	–	–	–	38	32	42*	28
Gao [21]	China	35	20	40	35	–	–	–	–	2	53	1*	73
Chuang [12]	Taiwan	70	73	69	65	71	72	69	65	0	143	0*	133
Bouzgarrou [13]	Tunisia	–	–	–	–	–	–	–	–	19	81	12	91
Abbas [14]	Pakistan	87	12	57	5	87	12	57	5	17	82	9	53
Pereira [6]	Brazil	110	18	84	10	110	18	84	10	17	111	13	81
Chen [15]	Taiwan	36	36	87	93	36	36	86	94	0	72	0*	180
Falleti [22]	Italy	21	29	35	61	–	–	–	–	8	42	25	71
Persico [16]	Ireland	218	10	104	6	218	10	104	6	74	154	18	92
Mangia [20]	Italy	246	24	136	9	246	24	136	9	40	230	23	122
Zein [19]	USA	29	1	33	3	29	1	33	3	12	18	6	30
	Egypt	20	2	41	3	20	2	41	3	5	17	14	30
Lio [18]	Italy	–	–	–	–	–	–	–	–	27	33	34*	101
Vidigal [17]	Ireland	69	9	33	3	69	9	33	3	27	51	6	30

^*The distribution of genotypes in controls was not consistent with Hardy–Weinberg equilibrium law (P < 0·0001).