marginal significancep = 0.06
Post hoc comparisons revealed that normalized N100 amplitudes in the 1% and 5% formalin groups were significantly larger than those in the NS and NT groups for any post-injection session ( p < 0.05 for all comparisons except for the marginal significance ( p = 0.06) between 1% formalin and NS groups during the 20–50 min interval after injection).