Figure 1:

Number of proximity events per user per day for 675 students in the Copenhagen Network Study proximity data¹⁰. Only close proximity Bluetooth connections (RSSI ≥ −75, corresponding to physical proximity of approximately one meter) with participating devices are shown, corresponding to 8.0% of all detected proximity events. Number of active users indicates users with at least one Bluetooth ping with a fellow participants. All other users only had empty scans or pings with non-participating devices.