Table 2.

Group means, standard deviations and test statistics from rank-sum testing for three error classes (sequencing, substitution, fluency) and three imitation tasks (MSW, NWR, NRT).

Task	Error class	Mean MA	SD	Mean MU	SD	RS z	RS p value
MSW	% Sequencing err.	6.45	2.73	0.59	0.65	−2.77	0.0056**
	% Substitution err.	1.66	0.96	0.21	0.34	−2.89	0.0039**
	% Fluency err.	0.18	0.32	0.38	0.44	0.76	0.4503
NWR	% Sequencing err.	17.46	7.27	5.59	2.08	−2.74	0.0062*
	% Substitution err.	6.25	2.76	3.82	2.26	−1.89	0.0591
	% Fluency err.	0.69	0.60	0.91	0.93	0.63	0.5272
NRT	% Sequencing err.	7.67	3.69	2.82	3.06	−2.03	0.0426*
	% Substitution err.	6.25	2.76	3.18	3.82	−1.79	0.0742
	% Fluency err.	0.69	0.60	0.98	1.54	−0.22	0.8258

Note. MU = unaffected regarding motor sequencing deficit; MA = affected regarding motor sequencing deficit; RS = rank-sum;

^*nominal statistical significance;

^**adjusted statistical significance. Negative z values indicate lower scores in the MA group, compared with the MU group.