Table 3.
Select longitudinal validity metrics for each device
| Model | Change in body fat (%) | 95 % CI for constant error (%) | Total error (%) | Equiv. | 90 % TOST (%) | ||||
|---|---|---|---|---|---|---|---|---|---|
| Mean | sd | Min | Max | CE | LL, UL | LL, UL | |||
| Criterion (4C) | 0·2 | 2·9 | –5·0 | 7·5 | – | – | – | ||
| Omron HBF-306 | 0·4 | 2·0 | –4·1 | 6·1 | 0·2 | –0·5, 0·9 | 2·1 | Yes | –0·4, 0·8 |
| RENPHO Scale | –0·1 | 1·3 | –3·9 | 3·2 | –0·3 | –1·1, 0·6 | 2·5 | Yes | –1·0, 0·4 |
| HAWANA Scale | 0·1 | 1·5 | –2·4 | 5·9 | 0·0 | –0·9, 0·8 | 2·6 | Yes | –0·8, 0·7 |
| Wyze Scale | 0·4 | 2·2 | –3·6 | 7·3 | 0·3 | –0·4, 1·0 | 2·1 | Yes | –0·3, 0·9 |
| INEVIFIT Scale | 0·2 | 1·6 | –2·6 | 6·5 | 0·0 | –0·7, 0·8 | 2·2 | Yes | –0·6, 0·7 |
| Weight Watchers Scale | –0·1 | 1·4 | –2·8 | 3·8 | –0·2 | –1·1, 0·6 | 2·5 | Yes | –0·9, 0·5 |
| Tanita UM-081 | 0·8 | 2·5 | –3·9 | 10·3 | 0·7 | 0·0, 1·3 | 1·9 | No | 0·1, 1·2 |
| Vitagoods Form Fit | –0·1 | 1·3 | –3·8 | 3·0 | –0·3 | –1·1, 0·6 | 2·5 | Yes | –1·0, 0·4 |
| Omron HBF-516 | 1·0 | 2·6 | –3·8 | 9·7 | 0·8 | 0·2, 1·4 | 1·9 | No | 0·3, 1·3 |
| Seca 804 | 1·4 | 3·6 | –4·2 | 10·0 | 1·3 | 0·4, 2·2 | 2·9 | No | 0·5, 2·0 |
| Withings Body Cardio | 0·8 | 2·6 | –3·6 | 10·0 | 0·6 | 0·0, 1·2 | 1·9 | No | 0·1, 1·1 |
| Tanita BC-554 Ironman | 0·8 | 2·4 | –3·5 | 9·3 | 0·6 | 0·0, 1·3 | 2·0 | No | 0·1, 1·2 |
| Tanita BC-568 InnerScan | 0·9 | 2·6 | –4·0 | 7·6 | 0·7 | 0·1, 1·3 | 1·9 | No | 0·2, 1·2 |
| InBody H20N | –0·2 | 2·3 | –5·2 | 4·8 | –0·4 | –1·0, 0·3 | 2·1 | Yes | –0·9, 0·2 |
| Seca mBCA 515/514 | 0·5 | 2·5 | –4·3 | 6·8 | 0·3 | –0·4, 1·0 | 2·1 | Yes | –0·3, 0·9 |
CE, constant error; LL, lower limit; Min, minimum; Max, maximum; TOST, two one-sided t tests; UL, upper limit.