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Frequency of studies according to conditions of data collection (laboratory or free living) and acquisition time t (from a few minutes to more than a year).
| Acquisition Time |
t < 1 h | 1 ≤ t < 24 h | 1 ≤ t < 7 d | 1 ≤ t < 4 w | 1 ≤ t < 12 m | t ≤ 1 y |
|---|---|---|---|---|---|---|
| Laboratory (N = 53) |
46 | 3 | 0 | 1 | 2 | 1 |
| Free Living (N = 17) |
1 | 1 | 1 | 8 | 3 | 3 |
