CALCA and Headache: A repeated measures ANOVA with Greenhouse-Geisser correction determined that mean CGRP levels did not show a statistically significant difference between participants experiencing migraine [F(2.73; 76.53) = 1.02; p = 0.385] or headache [F(2.81; 78.74) = 1.70; p = 0.176] and subjects with absence of headache or migraine.