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Characteristics and distribution of the selected studies.
| Characteristics | % | |
|---|---|---|
| Sensing duration | ||
| Just in time | 12 | 20.0 |
| Days | 17 | 28.3 |
| Months | 30 | 50.0 |
| Years | 1 | 1.7 |
| Population scale | ||
| Individual | 22 | 36.7 |
| Neighborhoods/city | 25 | 41.7 |
| States/nation | 9 | 15.0 |
| Multinations/global | 4 | 6.7 |
| Sensor data types | ||
| Physiological | 9 | 15.0 |
| Audio | 8 | 13.3 |
| GPS locations or call detailed records (CDRs) | 32 | 53.3 |
| Bluetooth proximity | 5 | 8.3 |
| Self-reported survey | 5 | 8.3 |
| Others (e.g., WiFi and social media) | 3 | 5.0 |
