Table 5.

Mean angle of vectors from AX3 for each activity (range in degrees) [95 % CI]

	Standing task	Walking	Sitting Rest	Sitting task	Lying	Steps	For lying versus not lying		For lying/sitting versus standing/walking/steps
							Optimal cut-off angle (°)	Youden’s index	Optimal cut-off angle (°)	Youden’s index
Wrist	47 (15–78) [44–50]	62 (5–80) [58–66]	24 (3–82) [20–28]	24 (7–58) [21–26]	21 (1–66) [17–25]	37 (11–76) [33–40]	12	0.418	24	0.512
Ankle	77 (60–86) [76–77]	68 (56–80) [67–69]	69 (34–86) [66–71]	71 (53–87) [69–73]	4 (0–41) [3–5]	72 (43–84) [71–74]	41	0.998	61	0.442
Hip	57 (9–77) [53–60]	62 (19–80) [58–65]	49 (5–80) [44–53]	56 (5–79) [52–61]	15 (0–44) [12–17]	63 (13–85) [58–67]	46	0.787	51	0.367
Thigh	76 (34–88) [74–78]	66 (26–79) [64–67]	19 (1–82) [14–24]	22 (2–86) [18–27]	10 (0–21) [8–11]	68 (4–81) [65–72]	32	0.611	38	0.908