Table 3.

Left and right HG grey matter volumes in professional musicians, amateurs and non-musicians. *Adjusted for the covariates of age, sex, cortical volume and scanner.

Category	Hemisphere	HG Volume* (mm3)		95% Confidence Interval
		Average	Std. Error	Lower Bound	Upper Bound
Non-musicians	Left	898	41	817	978
	Right	715	39	639	791
Amateurs	Left	990	29	933	1047
	Right	840	28	786	895
Professionals	Left	1015	30	956	1073
	Right	874	28	818	929