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Excitability data for motor nerves in normal controls (n = 38; black lines) and RLS patients (n = 34; grey lines). Dotted lines indicate the SD. SD time constant (P = 0.09) (A) and rheobase (P = 0.82) (B) were not different. C, no significant differences in measures of the recovery cycle (relative refractory period, P = 0.87; extent of refractoriness, P = 0.6; superexcitability, P = 0.6; late subexcitability, P = 0.53).
