Table 6.

Statistically significant post-cocoa intervention differences in selected frontal MRS ratios associated with PM and ozone cumulative values.

Pollutant variables	Frontal R Cho/Cr		Frontal L NAA/Cr		Frontal L mI/Cr
	R2	p-value	R2	p-value	R2	p-value
PM2.5 24 h
PM2.5 48 h			0.42	0.0214	0.50	0.0146
PM 2.5 72 h	0.45	0.032	0.40	0.0250	0.51	0.0125
PM2.5 7 days			0.42	0.0213	0.51	0.0126
PM10 24 h
PM10 48 h			0.42	0.0212	0.51	0.013
PM10 72 h	0.47	0.028	0.39	0.0290	0.50	0.013
PM10 7 days			0.42	0.0216	0.51	0.0123
Ozone 24 h
Ozone 48 h			0.40	0.0260	0.45	0.0226
Ozone 72 h			0.42	0.0213	0.51	0.0126
Ozone 7 days			0.42	0.0220	0.49	0.0158