1. A computerized system for effecting a statistical assessment of mortality-predictive patterns in longitudinal timeseries data from individual persons admitted to hospital-based intensive care, the system comprising: an accessing component for accessing mortality-predictive serial data received from a plurality of scores; a performing component for performing spectral analysis; a calculating component for calculating a Lyapunov exponent; and an outputting component for outputting values for the exponent for at least one point in time in the timeseries so that the outcome for the individual person may be predicted if the Lyapunov exponent is negative.