highly significantP < 0.0001
For example, late subexcitability was normal in EA2 ( Table 2 ) whereas it was increased in the 20 patients with EA1, so that the difference between the two types of episodic ataxia was highly significant (EA2: 14.4 ± 0.65%; EA1: 24.1 ± 1.7%; mean ± SE, P < 0.0001, Welch test).