Table 1.

Macromolecular content measured in young and older adults expressed as mean ± standard error of the mean, with p-values comparing the age groups. Content was quantified from metabolite spectra, i.e., STEAM spectra without inversion recovery.

	PCC			OCC
	Young adults	Older adults	p-value	Young adults	Older adults	p-value
Number of subjects	14	17		14	17
Age (years)	21 ± 1	75 ± 6		21 ± 1	74 ± 6
Macromolecular content (I.U.)	0.082 ± 0.002	0.091 ± 0.002	0.0021	0.088 ± 0.002	0.094 ± 0.002	0.0253