Development of the Short-Form Yin Deficiency Scale Using Three Item Reduction Approaches

Table 9

Correlations between the total and factor scores of the KNQ and the three short-form YDS versions.

KNQ		Total scores of the 14-item YDS by Rasch analysis	Total scores of the 14-item YDS by EITC	16-item YDS by factor analysis
				Total scores	Factors
					Fever	Cough	Fatigue-pain-weakness	Sweating-feet	Urine-hair
Total scores		0.564	0.498	0.517	0.363	0.211	0.499	0.379	0.380
Factors	Neuropsychological	0.489	0.448	0.457	0.331	0.187	0.447	0.316	0.335
	Respiratory	0.426	0.389	0.394	0.295	0.158	0.352	0.320	0.282
	Neuro-gastrointestinal	0.447	0.352	0.378	0.245	0.128	0.408	0.239	0.293
	Neuromuscular	0.405	0.385	0.407	0.267	0.219	0.349	0.361	0.284

KNQ, the Korean version of the Nijmegen Questionnaire; YDS, Yin Deficiency Scale; EITC, equidiscriminatory item-total correlation. . .