Table 2.

Correlation between multi-item scales and its own scale corrected for overlap (figures are Pearson correlation coefficient obtained from pretreatment assessment)*

	Dysphagia	Pain	Reflux	Eating restrictions	Anxiety
Dysphagia
Problems eating solid foods	0.82	0.52	0.40	0.22	0.21
Problems eating liquidized or soft food	0.87	0.34	0.29	0.01	0.08
Problems drinking liquids	0.78	0.17	0.23	0.04	0.03
Pain
Eating discomfort	0.61	0.76	0.55	0.32	0.33
Stomach pain	0.31	0.84	0.38	0.34	0.23
Stomach discomfort	0.27	0.89	0.46	0.42	0.31
Abdomen bolting	0.21	0.62	0.41	0.24	0.36
Reflux
Acid or bile problem	0.30	0.44	0.83	0.21	0.30
Acid indigestion or heartburn	0.24	0.52	0.73	0.21	0.18
Belching trouble	0.35	0.33	0.69	0.39	0.25
Eating restrictions
Full up too quickly	0.34	0.54	0.46	0.74	0.35
Trouble enjoying meals	0.38	0.34	0.20	0.72	0.08
Long time to complete meals	0.20	0.40	0.33	0.74	0.38
Eating trouble in front of other people	0.08	0.46	0.35	0.77	0.20
Anxiety
Thinking about illness	0.19	0.39	0.31	0.43	0.92
Worry about low weight	0.18	0.42	0.37	0.34	0.85
Health worry	0.04	0.28	0.01	0.07	0.46

* Similar results were obtained from the post-treatment assessment. To avoid confusion the correlation coefficients are not presented in this table.

** Excellent correlation ≥ 0.81-1.0, 0.61-0.80 very good, 0.41-0.60 good, 0.21-0.40 fair, and 0-0.20 poor