GFAP and depressive symptom measurement: When comparing all controls (N = 38) with available GFAP results and a matched group of patients with depression (N = 38), differences in age (patient group: 36.18 ± 12.97 years; controls: 34.84 ± 12.11 years; T = 0.466; p = 0.642) and sex (patients: five males and 33 females; controls: six males and 32 females; Chi2 = 0.106, p = 0.744) were no longer evident.