Table 2. Results of the meta-analysis on XRCC1 polymorphisms and childhood ALL risk.

Polymorphism	Analysis	Case/Control	Additive model(aa vs AA)		Dominant model(Aa+aa vs AA)		Recessive model (aa vs AA+Aa)
			OR[95% CI]	P/P het	OR[95% CI]	P/P het	OR[95% CI]	P/P het
Arg399Gln	Overall	880/1311	1.501[1.112, 2.026]	0.008/0.384	1.316[1.104, 1.569]	0.002/0.016	1.324[0.998, 1.757]	0.052/0.628
	Asian	225/434	2.338[1.254, 4.359]	0.008/0.903	2.108[1.498, 2.967]	0.000/0.821	1.698[0.937, 3.077]	0.081/0.706
	Caucasian	334/396	1.289[0.830, 2.000]	0.258/0.168	1.275[0.945, 1.722]	0.112/0.381	1.138[0.760, 1.704]	0.530/0.228
	Mestizo	120/120	1.711[0.653, 4.479]	0.274/−	1.306[0.787, 2.169]	0.302/−	1.556[0.612, 3.954]	0.353/−
	Mixed	201/361	1.227[0.629, 2.397]	0.548/−	0.845[0.597, 1.194]	0.339/−	1.358[0.707, 2.606]	0.358/−
Arg280His	Overall	345/554	1.251[0.371, 4.220]	0.709/0.675	1.125[0.805, 1.574]	0.490/0.534	1.203[0.357, 4.055]	0.765/0.693
	Asian	225/434	1.053[0.251, 4.426]	0.944/0.425	1.172[0.774, 1.775]	0.453/0.284	0.989[0.234, 4.175]	0.988/0.461
	Mestizo	120/120	2.023[0.180, 22.720]	0.568/−	1.043[0.590, 1.843]	0.885/−	2.017[0.180, 22.545]	0.569/−
Arg194Trp	Overall	783/1180	0.806[0.451, 1.438]	0.465/0.041	1.056[0.850, 1.312]	0.625/0.059	0.797[0.445, 1.426]	0.444/0.070
	Asian	225/434	0.710[0.319, 1.578]	0.400/0.014	0.966[0.684, 1.363]	0.843/0.007	0.714[0.319, 1.600]	0.414/0.028
	Caucasian	237/265	0.585[0.145, 2.351]	0.450/0.056	1.240[0.781, 1.969]	0.361/0.166	0.551[0.136, 2.233]	0.404/0.061
	Mestizo	120/120	2.150[0.520, 8.885]	0.290/−	1.265[0.730, 2.190]	0.402/−	2.053[0.501, 8.405]	0.317/−
	Mixed	201/361	0.443[0.049, 4.000]	0.469/−	0.929[0.586, 1.474]	0.755/−	0.446[0.050, 4.020]	0.472/−

OR Odds ratio; 95% CI 95% confidence interval.

a:minor allele; A:major allele.