These are Clutter Image Ratings that have been done from a previous study which are widely used across the world.
This shows the severity of the problem in many homes across the UK. 2.5 % of the UK suffer from this mental illness which is potentially 1.2 million.
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The rating are via The International OCD Foundation and were originally from a study by Frost RO, Steketee G, Tolin DF, Renaud S. Development and validation of the Clutter Image Rating. Journal of Psychopathology and Behavioral Assessment. 2008;32:401–417.