[Table/Fig-2]:

Posture positions that were analysed in the study (boy, 15 y): a. passive habitual posture, subject standing relaxed; hip, shoulder and ear are in front of the plumb line (yellow); b. actively erected posture, eyes open; note that all horizontal marker distances are reduced; c. actively erected posture, eyes closed; hip, shoulder and ear distances increase again (for description of posture positions, see text).