Re: ”High variability of the subjective visual vertical test of vertical perception, in some people with neck pain – Should this be a standard measure of cervical proprioception?”

We read with interest the article on increased variability in neck pain subjects when aligning a rod to vertical using the computerised rod-and-frame test (Treleaven & Takasaki, 2015). This prompted us to re-examine data we previously published on visual vertical and neck pain, also using the computerised rod-and-frame test (Bagust, et al, 2005; Docherty et al, 2012). Using analysis similar to that employed by Treleaven & Takasaki (2015) and Nyborg (1974), for determining Variable Error (VE) and Response Consistency (σ) respectively, we have calculated Variability as SD around the mean signed rod alignment error when the surrounding frame was tilted 18° from gravitational vertical in both clockwise and counter clockwise directions (Table 1).

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