1. A method for assessing the asthma status of a patient, comprising the steps of: receiving, by a data processing system, sensor-based environmental data; generating, by the data processing system, an asthma status score and a confidence rating for the asthma status score based at least in part on the sensor-based environmental data, wherein the confidence rating is generated based on at least one of a comparison of an actual number of parameters used to generate the asthma status score with a predefined number of parameters or a comparison of an actual change rate for the asthma status score with a predefined change rate; and displaying, by an asthma data output system, the asthma status score and the confidence rating.