Table 3.

Relationships between BDNF levels and cognitive domain scores and carbon monoxide concentration across BDNF Val66Met genotype groupings in smokers.

Cognitive	Val/Val (n = 21)		Val/Met (n = 65)		Met/Met (n = 17)
	Pearson		Pearson		Pearson
Domains	Partial r	p	Partial r	p	Partial r	p
Immediate memory	−0.06	0.84	−0.07	0.66	−0.07	0.80
Attention	−0.49	0.06	−0.34	0.019	−0.04	0.90
Language	−0.22	0.45	−0.02	0.90	−0.48	0.07
Visuospatial/Constructional	−0.37	0.20	−0.17	0.24	0.10	0.72
Delayed Memory	0.13	0.66	−0.08	0.58	−0.38	0.16
Total	−0.42	0.13	−0.18	0.23	−0.18	0.53
CO (ppm)	0.44	0.09	0.33	0.022	0.16	0.59

Note: CO = carbon monoxide; ppm = parts per million.