Table 2 Main outcomes of the classical test theoretical analysis.
From: Rasch analysis of the Psychiatric Out-Patient Experiences Questionnaire (POPEQ)
| Â | 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 | Â |
Variance 1st factor | 53.7% | 57.3% |