Table 1. Single-marker analysis of OCD association with catechol-O-methyltransferase and monoamine oxidase A single-nucleotide polymorphisms.

Gene	SNP	OR	CHISQ	P	CHISQ_PAR	P_PAR	CHISQ_COM	P_COM
COMT	rs737866	0.756	6.127	0.013	2.286	0.131	7.86	0.005
	rs933271	1.238	3.191	0.074	0.222	0.637	3.413	0.065
	rs5993883	1.164	2.042	0.153	1.882	0.17	3.133	0.077
	rs740603	0.97	0.091	0.762	2.574	0.109	0.057	0.812
	rs4680	1.034	0.099	0.752	1	0.317	0.002	0.96
	rs4646316	0.851	1.766	0.184	0.143	0.706	1.325	0.25
	rs165774	0.988	0.012	0.911	0.037	0.847	0.026	0.872
	rs9332377	0.88	0.832	0.362	0.6	0.439	1.174	0.278
MAO-A	rs1465107	0.957	0.066	0.798	0.4	0.527	0.277	0.599
	rs1465108	1.016	0.008	0.929	0.026	0.873	0	1
	rs6323	1.014	0.007	0.934	1.4	0.237	0.2	0.655
	rs979606	1.094	0.269	0.604	0.471	0.493	0.024	0.877
	rs979605	1.103	0.343	0.558	0.641	0.423	0.022	0.882

SNP: single-nucleotide polymorphism; TDT: transmission/disequilibrium test; OR: TDT odds ratio; CHISQ: TDT chi-square value; P: TDT p value; CHISQ_PAR: parental discordance test chi-square value; P_PAR: parental discordance test p value; CHISQ_COM: combined test chi-square value; P_COM: combined test p value; COMT: catechol-O-methyltransferase; MAO-A: monoamine oxidase-A