PMP22 and neuropathy: However, MMN patients, as a result of the specific neuropathy features, show a highly statistically larger TD than controls (p = 0.0012) and a statistically larger TD than CIDP signals (p = 0.025; Wilcoxon rank sum test); moreover, CIDP patients have a larger TD than controls (close to the limit of significance: p = 0.051).