Is the Pain Visual Analogue Scale Linear and Responsive to Change? An Exploration Using Rasch Analysis
Figure 5
Standardised Response Means displayed by baseline raw pain VAS score.
Inclusion criteria into the study included a minimum score on a single pain VAS of 30; although on the seven daily VAS measures some scored below 30 mm, these numbers were small. Standardised Response Means (SRM) data for those with daily measurs below 30 mm have therefore been combined into one group.