Table 4.

Mean age in older adult group based on allelic distribution of COMT, DRD2 and BDNF genotypes, and NHPA score. There was only one subject with NHPA=0 and one subject with NHPA=1. Therefore, they were not included in the analyses.

	Allele	Mean age in OA group	Standard deviation
COMT	mm	71	4.43
	vm	72	5.33
	vv	70	4.38
DRD2	GG	72	4.30
	GT	71	6.10
	TT	68	3.26
BDNF	vv	71	4.23
	vm	73	5.22
	mm	69	5.51
NHPA	2	70	3.98
	3	72	5.88
	4	71	4.98
	5	73	4.63
	6	73	0