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Source of the health-related data in percentage. SMS: short message service; API: application program interface; GPS: global positioning system.
| Source of data | Studies, n |
| Camera | 3 |
| Google APIs | 3 |
| Battery level & stats | 5 |
| Magnetometer | 6 |
| Bluetooth | 6 |
| SMS & calls | 13 |
| Gyroscope | 14 |
| Microphone | 17 |
| Wi-Fi | 15 |
| Smartphone & app usage | 19 |
| GPS | 48 |
| Accelerometer | 35 |
| Others | 8 |
