The most distinctive feature of PSYCHLOPS is that it is highly
sensitive to change

PSYCHLOPS elicits psychometric information covering three domains: Problems, Function and Wellbeing

• Responsiveness to change is measured using the Effect Size

• UK based validation studies using PSYCHLOPS have found Effect Sizes of 1.53 and 1.61 (Effect Sizes >0.80 are generally considered large for health service related outcomes)

• Captures improvement, or otherwise, during and after the course of therapy

• Test-retest reliability: intra-class correlation coefficient, 0.70

• Internal reliability: alpha scores, 0.75 pre-therapy and 0.83 post-therapy

• Convergent validity: Spearman’s rho, 0.61 (comparison with CORE-OM); Spearman’s rho, 0.47 (comparison with HADS)
  

• Concurrent validity: t = -6.30; P<0.001; comparison of scores of patient self-report ‘much better’ compared with ‘a little better’

• Freetext responses: may contribute usefully to the process of therapy and provide rich source of material for qualitative analysis