Reliability and validity of two fitness tracker devices in the laboratory and home environment for older community-dwelling people

Table 3 Test-retest reliability, comparing fitness tracker devices between 2MWT(1) and 2MWT(2)

2MWT(1) versus 2MWT(2)	Mean Difference (95%CI)	ICC (95%CI)
Number of steps (Flex blue)	2.87 (−6.26, 12.00)	0.79 (0.57, 0.90)
Number of steps (Flex black)	−2.13 (−8.46, 4.20)	0.87 (0.73, 0.94)
Number of steps (ChargeHR purple)	1.32 (−2.97, 5.61)	0.96 (0.91, 0.98)
Number of steps (ChargeHR black)	0.00 (−5.50, 5.50)	0.92 (0.84, 0.96)
Distance walked	−3.26 (−4.44, −2.07)	0.98 (0.85, 0.99)

Note. 2MWT(1): 2 Minute Walk Test number 1, 2MWT(2): 2 Minute Walk Test number 2, ICC: Intra Class Correlation, 95%CI: 95% Confidence Interval. Distance walked was measured by laps undertaken (8 m distance) plus distance from tape for final lap (m)

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