Table 2. Test -retest reliability of level walking for Control and ABI.
Control
t test Dependent, equal
variance, 2 tailed
Control
λ Bias
(Random error)
Control
ɸ %
variability
Control
Mean
ICC [3, 1]
Walking speed t (20) = 0.66, NS -0.02 (0.25) 8.1 0.70
Gross Oxygen Consumption t (20) = 1.02, NS -0.30 (2.73) 11.6 0.55
Net Oxygen Consumption t (20) = 1.53, NS -0.43 (2.43) 12.7 0.68
Gross oxygen cost t (20) = 0.32, NS 0.00 (0.05) 14.7 0.42
Net oxygen cost t (20) = 0.19, NS 0.00 (0.02) 17.3 0.61
ABI
t test Dependent, equal
variance, 2 tailed
ABI
λ Bias
(Random error)
ABI
ɸ %
variability
ABI
Mean
ICC [3,1]
Walking speed t (9) = 0.53, NS -0.02 (0.28) 13.7 0.89
Gross Oxygen Consumption t (9) = 0.47, NS 0.18 (2.33) 11.4 0.51
Net Oxygen Consumption t (9) = 0.65, NS 0.24 (2.02) 10.5 0.64
Gross oxygen cost t (9)=2.87, * 0.05 (0.10) 17.4 0.97
Net oxygen cost t (9)=3.02, * 0.04 (0.04) 20.8 0.93
Walking speed (m·s); oxygen consumption (ml·kg·min) and cost (ml·kg ·m). NS = non-significant.
p < 0.05.
ɸ Percentage variability was calculated by averaging the absolute value of the difference between each measurement of the group, dividing this by the average of the group, and multiplying by 100.
λ Bias (mean difference) (± Random error) (1.96 SD difference).