Table 5. Power analysis result for the Weighted Laterality Quotient (WLQ).

Sites		Controls	Patients	Mean diff.	Power	Req'd mean diff. for P > 0.8
Site-A	Mean	0.521	0.409	0.112	0.095	0.499
	STD	0.482	0.493
Site-C	Mean	0.811	0.879	0.068	0.103	0.284
	STD	0.155	0.244
Site-E	Mean	0.632	0.646	0.014	0.052	0.283
	STD	0.251	0.253
Site-G	Mean	0.614	0.888	0.274	0.617	0.341
	STD	0.410	0.104
Site-H	Mean	0.186	0.508	0.323	0.090	0.351
	STD	0.607	0.367
All sites	Mean	0.524	0.635	0.110	0.113	0.178
	STD	0.473	0.378

STD, standard deviation.