Methods and user interfaces are provided for the display of data comprising series of data over time, with particular application to medical laboratory results and prescriptions of medication. A user may view multiple results simultaneously in a single display, with the abilities to zoom the time scale in and out and to select the time period for which results are displayed. Multiple displayed items of data may be selected for simultaneous display along a common time axis in a zoomable graph, facilitating interpretation of relationships between and/or among data items.