Research Article
Development of the 8-Item Phlegm Pattern Questionnaire (PPQ-8) Using Rasch Analysis
Table 4
Item difficulty and fitting levels of the short form PPQ using Rasch analysis.
| | Iteration | Item | Raw score | Model measure | Infit MnSq | Outfit MnSq |
| | First | Lumps (Q22) | 654 | 0.88 | 1.64 | 1.62 | | Flank pain (Q18) | 702 | 0.60 | 1.30 | 1.27 | | Poor appetite (Q7) | 697 | 0.63 | 1.18 | 1.13 | | Fatigue (Q25) | 1150 | −1.34 | 1.01 | 1.05 | | Stomach fullness (Q6) | 820 | <0.01 | 1.00 | 1.03 | | Dizziness (Q12) | 911 | −0.40 | 0.84 | 0.87 | | Head unclearness (Q10) | 965 | −0.62 | 0.80 | 0.81 | | Chest discomfort (Q16) | 847 | −0.12 | 0.76 | 0.76 | | Breath shortness (Q4) | 745 | 0.37 | 0.74 | 0.75 |
| | Second | Flank pain (Q18) | 702 | 0.77 | 1.39 | 1.34 | | Poor appetite (Q7) | 697 | 0.80 | 1.23 | 1.17 | | Stomach fullness (Q6) | 820 | 0.12 | 1.07 | 1.08 | | Fatigue (Q25) | 1150 | −1.35 | 1.04 | 1.07 | | Dizziness (Q12) | 911 | −0.31 | 0.92 | 0.93 | | Head unclearness (Q10) | 965 | −0.56 | 0.86 | 0.87 | | Chest discomfort (Q16) | 847 | −0.01 | 0.81 | 0.81 | | Breath shortness (Q4) | 745 | 0.52 | 0.80 | 0.79 |
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