Table 1 Physical behavior assessed by accelerometer-based methods evaluating validity, subdivided by level of evidencea, and criteria for acceptable outcome values
Physical behavior | Level of Evidence | ||
Level 1 | Level 2 | Level 3 | |
Physical activity | Indirect calorimetry to score energy expenditure, e.g., DLW, AEE | Direct observation to score activity type | Pedometer (daily) step counts |
Direct video observation to score activity type | Accelerometer-based magnitude of acceleration (different brand/type) | ||
Sedentary behavior (primarily defined as an activity type, and secondarily as an intensity) | Direct video observation to score activity type | Direct observation to score activity type | Accelerometer-based magnitude of acceleration (different brand/type) |
Indirect calorimetry to score energy expenditure | Accelerometer-based orientation classification (thigh data), e.g., activPAL | ||
Sleep | Polysomnography | Videosomnography or direct video observation to classify sleep–wake states | Direct observation to classify sleep–wake states |
Indirect calorimetry, e.g., SMR | Accelerometer-based magnitude of acceleration (different brand/type) | ||
Outcome value | Acceptable results | ||
Level 1 | Level 2 | Level 3 | |
rp, rsp, r, R2 | ≥ .70 | ≥ .60 | ≥ .60 |
AUC-ROC, accuracy, Se, Sp | ≥ .80 | ≥ .80 | ≥ .80 |
ICC, CCC κ, κw, κqw | ≥ .70 | ≥ .70 | ≥ .70 |