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Table 3 Cut-off points for min·day−1 in physical activitya/sedentary to differentiate between normal weight and overweight/obeseb children

From: BMI and recommended levels of physical activity in school children

  AUC (95%CI) Youden index Cut-off (min·day−1) Sensitivity Specificity
Total
 Sedentary 0.64 (0.58; 0.70) .255 388 0.69 0.57
 LPA 0.58 (0.52; 0.64) .205 348 0.71 0.50
 MPA 0.61 (0.55; 0.67) .234 38 0.79 0.45
 VPA 0.64 (0.58; 0.70) .260 5 0.79 0.47
 MVPA 0.62 (0.56; 0.68) .230 46 0.78 0.45
Male
 Sedentary 0.63 (0.54; 0.72) .249 382 0.77 0.48
 LPA 0.60 (0.51; 0.68) .286 344 0.64 0.65
 MPA 0.63 (0.54; 0.72) .239 69 0.62 0.62
 VPA 0.67 (0.58; 0.75) .290 20 0.55 0.74
 MVPA 0.65 (0.56; 0.73) .276 76 0.77 0.51
Female
 Sedentary 0.65 (0.57; 0.72) .288 410 0.59 0.69
 LPA 0.55 (0.47; 0.64) .137 349 0.78 0.36
 MPA 0.63 (0.55; 0.71) .263 39 0.67 0.59
 VPA 0.66 (0.58; 0.74) .317 6 0.65 0.67
 MVPA 0.64 (0.56; 0.72) .271 46 0.66 0.61
  1. P-values indicate AUC significantly > 0.50
  2. aLPA: light physical activity (1.5–3.9 METs), MPA: moderate physical activity (MPA; 4–5.9 METs), VPA: vigorous physical (VPA; > = 6 METs)
  3. MVPA: moderate to vigorous physical activity
  4. bClassification through BMI z-scores, calculated according to WHO standards: normal weight > = − 2 SD and < = + 1SD, overweight/obese > +1 SD