Table 4. Mean metabolite estimated precision (%CRLB) by group for each of four metabolites in three voxels.

	Control mean (s.d.)	ADHD			P-value
		Total	Medicated	Not medicated
		mean (s.d.)	mean (s.d.)	mean (s.d.)
Basal ganglia
Cho	0.095 (0.026)	0.097 (0.027)	0.089 (0.018)	0.104 (0.032)	0.279
Cr	0.071 (0.019)	0.071 (0.014)	0.068 (0.009)	0.073 (0.016)	0.581
NAA	0.100 (0.028)	0.109 (0.023)	0.106 (0.022)	0.111 (0.025)	0.393
Glx	0.097 (0.04)	0.100 (0.044)	0.086 (0.012)	0.111 (0.056)	0.194
DLPFC
Cho	0.075 (0.018)	0.067 (0.011)	0.068 (0.012)	0.066 (0.011)	0.161
Cr	0.067 (0.013)	0.061 (0.008)	0.063 (0.009)	0.06 (0.008)	0.120
NAA	0.072 (0.017)	0.067 (0.012)	0.067 (0.011)	0.067 (0.013)	0.456
Glx	0.144 (0.056)	0.103 (0.033)	0.099 (0.033)	0.105 (0.034)	0.004
Parietal cortex
Cho	0.089 (0.015)	0.091 (0.015)	0.093 (0.016)	0.090 (0.015)	0.654
Cr	0.066 (0.012)	0.065 (0.01)	0.068 (0.012)	0.063 (0.009)	0.511
NAA	0.072 (0.012)	0.075 (0.015)	0.076 (0.017)	0.074 (0.014)	0.671
Glx	0.092 (0.02)	0.101 (0.042)	0.095 (0.023)	0.105 (0.053)	0.488

Abbreviations: ADHD, attention-deficit hyperactivity disorder; Cho, choline; Cr, creatine; %CRLB, % Cramer–Rao Lower Bounds; DLPFC, dorsolateral predfrontal cortex; Glx, glutamate and glutamine; NAA, N-acetylaspartate.

Data are given as mean (s.d.). P-value: two-tailed t-test for analysis of variance comparing control; ADHD medicated and ADHD naive groups by %CRLB.