Development of the 8-Item Phlegm Pattern Questionnaire (PPQ-8) Using Rasch Analysis
Table 6
Equidiscriminative item-total correlation (EITC) results by three percentile points.
25% cut-off points of the total scores (86 points)
Spearman correlation
50% cut-off points of the total scores (99 points)
Spearman correlation
75% cut-off points of the total scores (116 points)
Spearman correlation
Chest discomfort
0.553
Dizziness
0.621
Breath shortness
0.556
Head unclearness
0.527
Limb heaviness
0.565
Dizziness
0.544
Dizziness
0.517
Head unclearness
0.560
Chest discomfort
0.522
Breath shortness
0.514
Breath shortness
0.558
Palpitation
0.500
Palpitation
0.510
Chest discomfort
0.553
Headache
0.493
Headache
0.495
Palpitation
0.549
Limb heaviness
0.489
Limb heaviness
0.488
Abdominal fullness
0.547
Indigestion
0.471
Indigestion
0.453
Headache
0.526
Head unclearness
0.454
Fatigue
0.447
Sickness
0.518
Abdominal fullnessa
0.453
Abdominal fullness
0.437
Indigestion
0.514
Startled by faint noise
0.451
Cough
0.426
Startled by faint noise
0.496
Sickness
0.441
Startled by faint noise
0.419
Fatigue
0.47
Fatigue
0.418
Tinnitus
0.391
Poor appetite
0.425
Joint pain
0.357
Poor appetite
0.383
Cough
0.404
Cough
0.354
Sickness
0.375
Mucousy stool
0.401
Feeling of foreign body
0.335
Rumbling abdomen
0.373
Flank pain
0.400
Yellow face
0.322
Flank pain
0.371
Feeling of foreign body
0.381
Rumbling abdomen
0.317
Lumps
0.370
Joint pain
0.370
Itching
0.315
Mucousy stool
0.359
Tinnitus
0.364
Mucousy stool
0.313
Sputum
0.351
Rumbling abdomen
0.362
Poor appetite
0.312
Joint pain
0.350
Yellow face
0.357
Flank pain
0.305
Itching
0.350
Sputum
0.352
Tinnitus
0.263
Dark circle
0.326
Itching
0.349
Sputum
0.240
Feeling of foreign body
0.319
Lumps
0.320
Dark circle
0.225
Yellow face
0.316
Dark circle
0.305
Lumps
0.222
Items in bold indicate the top-three questionnaire items, by the three percentile points. aDiscarded questionnaire item to match the numbers of questionnaire items by EITC with those by Rasch analysis. All correlations had < 0.01.
