Table 3. Cut-off points and accuracy of the daily step-based recommendations related to achieving at least 60 min per day of moderate-to-vigorous physical activity.
Step-based index Cut-off point %TP AUC (95% CI) Se Sp J max P k
Uncensored total steps 11,111 steps 14.29 0.94 (0.89-0.99) 0.85 0.94 0.78 0.93 0.67
Censored total steps 8,606 steps 20.63 0.95 (0.90-1.00) 0.92 0.88 0.80 0.88 0.55
Uncensored steps/ min 8.7 steps/ min 26.19 0.92 (0.85-0.99) 0.92 0.81 0.74 0.83 0.44
Censored steps/ min 45.1 steps/ min 31.75 0.76 (0.60-0.92) 0.85 0.74 0.59 0.75 0.31
Min ≥ 65 steps/ min 60 min 14.29 0.90 (0.80-1.00) 0.77 0.93 0.70 0.91 0.60
Steps ≥ 65 steps/ min 5,684 steps 15.87 0.89 (0.78-1.00) 0.85 0.92 0.77 0.91 0.62
PC min ≥ 65 steps/ min 4.9% 19.05 0.89 (0.79-1.00) 0.85 0.88 0.73 0.88 0.53
PC steps ≥ 65 steps/ min 55.0% 15.08 0.80 (0.63-0.97) 0.69 0.91 0.60 0.89 0.50
Peak 1-min cadence 124 steps 34.13 0.76 (0.61-0.91) 0.77 0.71 0.48 0.71 0.24
Peak 30-min cadence 86 steps 39.68 0.73 (0.59-0.88) 0.69 0.64 0.33 0.64 0.15*
Peak 60-min cadence 72 steps 32.54 0.78 (0.64-0.91) 0.62 0.71 0.32 0.70 0.17*
%TP, Percentage of total positive cases according to the specified cut-off point; AUC (95% CI), Area Under the Curve (95% confident interval); Se, Sensitivity; Sp, Specificity; J max, Youden’s index; P, Percentage of agreement; k, Kappa coefficient; PC, Percentage.
* p < 0.05
‡ p < 0.01
† p < 0.001.