a trend towards significanceP = 0.080
In regression analysis including all participants, neither TMD nor migraine as main effects were associated with the plasma CGRP concentration ( P = 0.761 and P = 0.972, respectively), and no statistically significant TMD × migraine interaction was noted ( P = 0.696) ( Table 2 ). Association Between Plasma CGRP Concentration and Participants’ Characteristics In analyses including all participants, participant age was the only characteristic statistically significantly associated with plasma CGRP concentration ( P = 0.034), while the association with BMI showed a trend towards significance ( P = 0.080) ( Table 3 ).