Table 3. Evaluation of discriminative ability of optimal thresholds to identify overweight/obesity 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 | 574 | 71 | 62 | 0.69 | <0.01 | 0.64 | 0.32/0.05 | 0.25 | 0.75 | –0.41 | 105 | |
| MVPA by Freedson et al. (2005), min∙d–1 | 221 | 67 | 57 | 0.65 | <0.01 | 0.59 | 0.36/0.06 | 0.17 | 0.69 | –0.47 | 69 | |
| MVPA by Freedson et al. (1997), min∙d–1 | 129 | 53 | 65 | 0.61 | 0.01 | 0.63 | 0.30/0.08 | 0.13 | 0.71 | –0.45 | 81 | |
| MVPA by EYHS, min∙d–1 | 61 | 65 | 60 | 0.67 | <0.01 | 0.60 | 0.34/0.06 | 0.18 | 0.71 | –0.45 | 79 | |
| MVPA by Evenson et al. (2008), min∙d–1 | 49 | 65 | 60 | 0.67 | <0.01 | 0.61 | 0.33/0.06 | 0.17 | 0.71 | –0.45 | 79 | |
| MVPA by Puyau et al. (2002), min∙d–1 | 22 | 61 | 66 | 0.67 | <0.01 | 0.64 | 0.30/0.06 | 0.19 | 0.74 | –0.42 | 97 | |
| Girls (N = 175) | ||||||||||||
| Counts per minute | 578 | 65 | 63 | 0.64 | 0.02 | 0.63 | 0.18/0.05 | 0.35 | 0.73 | –0.28 | 79 | |
| MVPA by Freedson et al. (2005), min∙d–1 | 222 | 58 | 60 | 0.62 | 0.05 | 0.59 | 0.20/0.06 | 0.27 | 0.68 | –0.32 | 63 | |
| MVPA by Freedson et al. (1997), min∙d–1 | 129 | 50 | 69 | 0.57 | 0.27 | 0.65 | 0.16/0.07 | 0.27 | 0.73 | –0.31 | 67 | |
| MVPA by EYHS, min∙d–1 | 61 | 62 | 64 | 0.65 | 0.02 | 0.62 | 0.18/0.06 | 0.32 | 0.71 | –0.30 | 73 | |
| MVPA by Evenson et al. (2008), min∙d–1 | 49 | 62 | 64 | 0.66 | 0.01 | 0.63 | 0.18/0.06 | 0.30 | 0.71 | –0.30 | 72 | |
| MVPA by Puyau et al. (2002), min∙d–1 | 24 | 69 | 59 | 0.68 | <0.01 | 0.58 | 0.22/0.04 | 0.36 | 0.69 | –0.30 | 68 | |
| Boys (N = 131) | ||||||||||||
| Counts per minute | 542 | 78 | 64 | 0.74 | <0.01 | 0.66 | 0.13/0.05 | 0.51 | 0.79 | –0.22 | 74 | |
| MVPA by Freedson et al. (2005), min∙d–1 | 221 | 78 | 54 | 0.67 | 0.01 | 0.58 | 0.16/0.04 | 0.48 | 0.72 | –0.24 | 63 | |
| MVPA by Freedson et al. (1997), min∙d–1 | 116 | 52 | 73 | 0.66 | 0.02 | 0.69 | 0.10/0.08 | 0.39 | 0.78 | –0.27 | 67 | |
| MVPA by EYHS, min∙d–1 | 59 | 70 | 59 | 0.68 | 0.01 | 0.60 | 0.14/0.06 | 0.42 | 0.72 | –0.27 | 59 | |
| MVPA by Evenson et al. (2008), min∙d–1 | 44 | 61 | 68 | 0.69 | 0.01 | 0.66 | 0.11/0.07 | 0.43 | 0.77 | –0.25 | 68 | |
| MVPA by Puyau et al. (2002), min∙d–1 | 17 | 57 | 79 | 0.66 | 0.02 | 0.74 | 0.08/0.08 | 0.44 | 0.83 | –0.24 | 77 | |
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.