Table 4.

screening capacity of the Barthel index to identify active patients

Definition	Threshold	AROC	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)
1	95	0.595 (0.512–0.678)	64.4 (48.8–78.1)	54.5 (45.7–63.2)	32.6 (23.0–43.3)	81.8 (72.2–89.2)
2	95	0.692 (0.590–0.795)	85.7 (57.2–98.2)	52.8 (44.8–60.6)	13.5 (7.2–22.4)	97.7 (92.0–99.7)
3	95	0.581 (0.503–0.658)	61.0 (47.4–73.5)	55.1 (45.7–64.3)	40.4 (30.2–51.4)	73.9 (63.4–82.7)
4	96	0.642 (0.554–0.730)	66.7 (49.0–81.4)	61.7 (53.1–69.8)	30.8 (20.8–42.2)	87.9 (79.8–93.6)

Results are expressed as value (95% confidence interval). AROC, area under the receiver operating curve; NPV, negative predictive value; PPV, positive predictive value. Definition 1: highest quartile of time spent in non-sedentary activities; definition 2, spending at least 20 min of moderate physical activity per day; definition 3, highest tertile of time spent in non-sedentary activities, definition 4, highest quintile of time spent in non-sedentary activities