GFAP and premenstrual tension: We observed an increase of GFAP in PMS cases compared to control (Fig. 3b), although this did not reach statistical significance (Wilcoxon Ranked Sum Test p > .05, mean and standard deviation in PMS cases was 0.53 ± 0.0.90 and 0.16 ± 0.22 in controls), with 11 out of 27 PMS cases (41%) and 6 out of 15 controls (40%) exhibiting undetectable levels.