1. A computer-implemented method for displaying a user interface (“UI”) comprising: receiving physiological monitoring data reflecting moment-by-moment values of one or more physiological parameters of a monitored subject during one or more time intervals; and displaying a computer UI comprising at least one avatar having a visual representation reflecting the physiology of the monitored subject; wherein the moment-by-moment appearance of the visual representation of the avatar is controlled in dependence on one or more of the received physiological parameters.