TABLE 4.

Between-group statistical comparison of zero crossings (A) and proportion of MEPs (MEPs with polyphasia/total number of MEPs for a patient) (B) (group-wise comparison: Wilcoxon rank-sum test, post-hoc comparison: Kruskal-Wallis test).

(A) Between-group statistical comparison of zero crossings
Groups	P-value (< 0.05)
Patients-relatives	0.537
Patients-controls	0.003*
Relatives-controls	0.009*
Comparing all 3 groups	0.0001*
(B) Between-group statistical comparison of proportion of MEPs (MEPs with polyphasia/total number of MEPs for a patient)
Groups	P-value (< 0.05)
Patients-relatives	0.432
Patients-controls	0.045 *
Relatives-controls	0.207
Comparing all 3 groups	0.125

*Statistically significant.