**Diversity of data**

**Time distribution of recordings per elder**

The white spaces can represent a group change or intervals when the system was not recording for more than 5 minutes.

**Thermix Recording Configurations**

**Dead intervals**

Thermix records and uploads small chunks of video to the cloud. There are two possible configurations: either Thermix saves chunks to the device disk continuously (continuous mode) or waits until a chunk is sent to start recording the next one (one-by-one mode).

**Clips in groups recorded with continuous mode are separated by a small time window (between 2 and 5 seconds in average), that corresponds to the time Thermix takes to compose the chunk. This means, Thermix did not wait for a video chunk to be sent before start recording the next one.**

*:***Continuous mode****Clips in groups recorded with one-by-one mode are separated by the time Thermix takes to compose the video chunk as in continuos mode plus the time the device takes to upload it to the cloud.**

**One-by-one***:***mode****Clips length**

Each group has clips of a certain duration that ranges between 2 and 15 seconds. Because Thermix excludes all frames

during a sensor recalibration, the number of frames in a clip will be less if a recalibration occurs. We estimate the average fps (frame per second)

depending on each device achieving ~5fps, ~3fps and ~2fps for the iPhone5+SLED, iPhone5s+Dongle and iPod+Dongle respectively.

**Temperature precision**

For R = raw thermal data returned from the sensor we construct a frame F, where F(i,j) corresponds to the element (i,j) of the frame adjusted by precision:

**Low precision:**F(i,j) = 2 * R(i,j) if 1>= R(i,j) >= 120 , 0 otherwise

**High precision:**F(i,j) = round(2 * R(i,j)) if 1 >= R(i,j) >=120, 0 otherwise

Where R(i,j) is the temperature expressed in Celsius degrees with one decimal place. The round function returns the integral value nearest to its argument, rounding half-way cases away from zero.

**Device**

To record we use Apple iOS devices and the Dongle and SLED versions of the FLIR One far-infrared sensor. FLIR One SDK for iOS devices delivers a resolution of 240x320 for Dongle sensors and 120x160 for SLED sensors.