Reliability and Construct Validity of the SENS Motion® Activity Measurement System as a Tool to Detect Sedentary Behaviour in Patients with Knee Osteoarthritis

Table 4

Agreement between observations in a controlled environment, via the application of the standardized physical activity protocol at study visits one and two, and the SENS motion system as the percentage of agreement for each participant and for the entire cohort (median and range).

Number	Study visit	Sedentary	Standing	Walking	Other activities	Total	Active	Sedentary	Total
(1)	1	96%	100%	59%	67%	68%	99%	96%	99%
	2	100%	92%	17%	100%	43%	100%	100%	100%
(2)	1	100%	92%	39%	91%	65%	100%	100%	100%
	2	96%	92%	24%	90%	53%	100%	100%	100%
(3)	1	100%	92%	46%	100%	65%	99%	100%	99%
	2	100%	92%	44%	-	62%	98%	100%	98%
(4)	1	100%	100%	13%	64%	39%	100%	100%	100%
	2	96%	92%	42%	88%	59%	100%	96%	99%
(5)	1	100%	100%	11%	55%	56%	100%	100%	100%
	2	100%	100%	18%	22%	53%	90%	100%	93%
(6)	1	96%	100%	2%	100%	33%	87%	96%	88%
	2	100%	92%	8%	100%	42%	100%	100%	99%
(7)	1	100%	92%	40%	100%	65%	100%	100%	100%
	2	100%	92%	31%	89%	59%	100%	100%	100%
(8)	1	96%	100%	48%	100%	64%	50%	100%	59%
	2	100%	92%	22%	100%	51%	66%	100%	74%
(9)	1	100%	100%	7%	100%	37%	100%	100%	100%
	2	100%	100%	0%	100%	41%	100%	100%	100%
(10)	1	96%	75%	54%	22%	61%	94%	96%	94%
	2	100%	92%	38%	29%	53%	97%	100%	98%
(11)	1	100%	100%	6%	83%	49%	98%	100%	99%
	2	100%	100%	2%	100%	49%	98%	100%	99%
(12)	1	83%	100%	43%	100%	59%	100%	83%	97%
	2	100%	100%	40%	100%	58%	100%	100%	100%
(13)	1	100%	100%	33%	100%	54%	100%	100%	100%
	2	100%	100%	32%	100%	52%	100%	100%	100%
(14)	1	100%	100%	57%	100%	70%	100%	100%	100%
	2	100%	83%	23%	100%	46%	98%	100%	99%
(15)	1	100%	100%	60%	80%	72%	99%	100%	99%
	2	100%	92%	13%	63%	38%	96%	100%	96%
(16)	1	96%	92%	3%	100%	33%	100%	96%	99%
	2	100%	92%	36%	100%	59%	100%	100%	99%
(17)	1	96%	100%	36%	100%	56%	100%	96%	99%
	2	100%	100%	35%	100%	56%	100%	96%	100%
(18)	1	96%	100%	0%	100%	33%	100%	100%	99%
	2	100%	92%	6%	88%	36%	100%	100%	100%
(19)	1	100%	100%	1%	100%	33%	98%	100%	100%
	2	100%	83%	11%	88%	38%	100%	100%	98%
(20)	1	100%	92%	9%	100%	34%	100%	100%	100%
	2	100%	92%	41%	100%	59%	100%	96%	100%
(21)	1	96%	92%	55%	100%	69%	100%	96%	99%
	2	96%	100%	33%	100%	55%	100%	100%	99%
(22)	1	100%	100%	22%	100%	55%	100%	100%	100%
	2	100%	100%	31%	100%	59%	99%	100%	100%
(23)	1	100%	92%	39%	100%	58%	98%	100%	99%
	2	100%	83%	28%	100%	50%	98%	100%	99%
(24)	1	100%	92%	58%	78%	69%	99%	100%	99%
	2	100%	92%	50%	100%	65%	100%	99%	99%
Median		100%	92%	31%	100%	55%	100%	100%	99%
Range		83–100%	75–100%	0–60%	22–100%	33–72%	50–100%	83–100%	59–100%
Mean		99%	95%	28%	89%	53%	97%	99%	97%
SD		3%	6%	18%	21%	11%	9%	3%	7%

-: missing observation.