A wearable device may include a housing formed and shaped to affix to a user and a sensor integrated into the housing and to engage a body of the user to take physiological measurements of the user to obtain first physiological data and second physiological data. A processing device located within the housing (or elsewhere, as in a server device) may receive the first physiological data and the second physiological data； analyze the first physiological data to determine a first correlation between the first physiological data and a physiological parameter； analyze the second physiological data to determine a second correlation between the second physiological data and the physiological parameter； and predict a change in a level of the physiological parameter according to a combination of the first correlation and the second correlation.
