Calibration of the risk prediction score for Severe High Altitude Illness in the group without previous experience of sojourn at high altitude (upper panel, n = 480) and with previous experience of sojourn at high altitude (lower panel, n = 537).

<p>Calibration of the risk prediction score for Severe High Altitude Illness in the group without previous experience of sojourn at high altitude (upper panel, n = 480) and with previous experience of sojourn at high altitude (lower panel, n = 537).