Table 4. Evaluation of discriminative ability of optimal thresholds to identify adiposity for counts per minute and moderate-to-vigorous physical activity derived from different cut-off points in children.
| Optimal threshold | Se (%) | Sp (%) | AUC | P-value | Probability of correct decision | Misclassification errors (Type I/Type II) | Validity coefficient | EU | ED | EMU | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total (N = 306) | ||||||||||||
| Counts per minute | 573 | 67 | 61 | 0.65 | <0.01 | 0.62 | 0.33/0.05 | 0.20 | 0.72 | –0.43 | 89 | |
| MVPA by Freedson et al. (2005), min∙d–1 | 222 | 64 | 57 | 0.63 | 0.01 | 0.57 | 0.38/0.05 | 0.14 | 0.66 | –0.48 | 55 | |
| MVPA by Freedson et al. (1997), min∙d–1 | 149 | 71 | 45 | 0.59 | 0.05 | 0.49 | 0.47/0.04 | 0.12 | 0.59 | –0.55 | 13 | |
| MVPA by EYHS, min∙d–1 | 59 | 59 | 62 | 0.61 | 0.02 | 0.61 | 0.32/0.07 | 0.10 | 0.69 | –0.46 | 69 | |
| MVPA by Evenson et al. (2008), min∙d–1 | 49 | 62 | 59 | 0.62 | 0.01 | 0.59 | 0.35/0.06 | 0.14 | 0.68 | –0.46 | 67 | |
| MVPA by Puyau et al. (2002), min∙d–1 | 23 | 64 | 59 | 0.65 | <0.01 | 0.60 | 0.35/0.06 | 0.15 | 0.69 | –0.46 | 71 | |
| Girls (N = 175) | ||||||||||||
| Counts per minute | 573 | 54 | 65 | 0.59 | 0.14 | 0.63 | 0.17/0.07 | 0.28 | 0.71 | –0.31 | 71 | |
| MVPA by Freedson et al. (2005), min∙d–1 | 212 | 42 | 73 | 0.59 | 0.15 | 0.69 | 0.13/0.09 | 0.24 | 0.75 | –0.30 | 78 | |
| MVPA by Freedson et al. (1997), min∙d–1 | 107 | 35 | 87 | 0.54 | 0.55 | 0.79 | 0.07/0.10 | 0.30 | 0.84 | –0.26 | 102 | |
| MVPA by EYHS, min∙d–1 | 63 | 58 | 58 | 0.60 | 0.12 | 0.58 | 0.21/0.06 | 0.26 | 0.66 | –0.33 | 58 | |
| MVPA by Evenson et al. (2008), min∙d–1 | 49 | 62 | 64 | 0.62 | 0.06 | 0.63 | 0.18/0.06 | 0.30 | 0.71 | –0.30 | 72 | |
| MVPA by Puyau et al. (2002), min∙d–1 | 20 | 54 | 75 | 0.66 | 0.01 | 0.71 | 0.13/0.07 | 0.34 | 0.79 | –0.26 | 92 | |
| Boys (N = 131) | ||||||||||||
| Counts per minute | 542 | 79 | 63 | 0.73 | <0.01 | 0.64 | 0.14/0.04 | 0.47 | 0.75 | –0.21 | 70 | |
| MVPA by Freedson et al. (2005), min∙d–1 | 221 | 84 | 54 | 0.67 | 0.02 | 0.58 | 0.17/0.02 | 0.50 | 0.70 | –0.22 | 64 | |
| MVPA by Freedson et al. (1997), min∙d–1 | 149 | 90 | 46 | 0.65 | 0.04 | 0.52 | 0.20/0.02 | 0.50 | 0.65 | –0.23 | 55 | |
| MVPA by EYHS, min∙d–1 | 53 | 53 | 71 | 0.63 | 0.07 | 0.68 | 0.11/0.07 | 0.36 | 0.76 | –0.25 | 67 | |
| MVPA by Evenson et al. (2008), min∙d–1 | 44 | 58 | 68 | 0.64 | 0.05 | 0.65 | 0.12/0.06 | 0.38 | 0.73 | –0.25 | 64 | |
| MVPA by Puyau et al. (2002), min∙d–1 | 17 | 53 | 77 | 0.63 | 0.07 | 0.73 | 0.08/0.08 | 0.37 | 0.79 | –0.24 | 73 | |
AUC–area under the curve, ED–expected disutility, EMU–expected maximal utility, EU–expected utility, EYHS–European Youth Heart Study, MVPA–moderate-to-vigorous physical activity, Se–sensitivity, Sp–specificity.