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Table 2 Main outcomes of the classical test theoretical analysis.

From: Rasch analysis of the Psychiatric Out-Patient Experiences Questionnaire (POPEQ)

  2004 2007
Mean score (st.dev.) 0-100 68.7 (18.3) 67.3 (19.7)
Cronbach's alpha 0.91 0.92
Test-retest reliability 0.90  
Variance 1st factor 53.7% 57.3%