Before revision:  We derived features from the phone and wearable device for length of time spent at home,  distance travelled from home,  heart rate, sleep , and patterns of phone use.
After revision:  We derived features from the phone and wearable device for length of time spent at home, distance travelled from home, maximum number of Bluetooth-enabled nearby devices (as a proxy for physical distancing), step count, average heart rate, sleep , and patterns of phone use.