Additional file 4 of New diagnostic criteria for metopic ridges and trigonocephaly: a 3D geometric approach

Supplementary Material 4. Mean age, cephalic index, intracranial volume (ICV) and interfrontal angle (IFA) for each group. MR: metopic ridge; C: control; TG: trigonocephaly; f: female; m: male; Sd: standard deviation.补充材料4。各组的平均年龄、头指数（cephalic index）、颅内体积（intracranial volume，ICV）与额间角（interfrontal angle，IFA）。其中，MR指代额嵴（metopic ridge）；C指代对照组（control）；TG指代三角头畸形组（trigonocephaly，TG）；f指代女性（female）；m指代男性（male）；Sd指代标准差（standard deviation，Sd）。