Table 1.

Results from the repeatability analysis when all subjects were analyzed together.

	RC (mm)	${\mu }_{\mathrm{\Delta }}$ (mm)	${\sigma }_{\mathrm{\Delta }}$ (mm)	$\mathrm{\Delta }<10\text{mm}$ (%)	$\mathrm{\Delta }<20\text{mm}$ (%)	90% threshold (mm)
Q1	39	5	19	47	75	32
Q2	46	4	23	40	65	38

The table contains the repeatability coefficient (RC), signed mean difference between cycles (${\mu }_{\mathrm{\Delta }}$), standard deviation of the difference between cycles (${\sigma }_{\mathrm{\Delta }}$), percent of trials with between cycle differences ($\mathrm{\Delta }$) less than 10 mm and 20 mm, and the 90% threshold. The 90% threshold was defined as the difference magnitude for which 90% of responses had absolute differences less than the threshold. Although the (RC) for both questions was large, 75% of the differences between cycles ($\mathrm{\Delta }$) for Q1 were below 20 mm, implying that the VAS survey could measure a signal but not as well as for pain.