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

Table 4

Item difficulty and fitting levels of the short-form Yin Deficiency Scale using Rasch analysis.

	Item (no.)	Raw score	Model measure	Infit MnSq	Outfit MnSq
First analysis	Night cough (Q1)	341	0.79	0.94	0.99
	Afternoon cough (Q3)	318	0.97	0.72	0.67
	Afternoon flush (Q5)	383	0.49	0.83	0.81
	Dry mouth (Q6)	486	−0.16	1.04	1.02
	Weakness of the lower limbs (Q8)	473	−0.08	0.78	0.78
	Dull pain of the ankle or knee (Q9)	494	−0.22	1.06	1.06
	Low back pain (Q10)	566	−0.70	0.97	0.97
	Wake due to night urination (Q11)	486	−0.16	1.40	1.46
	Frequent urination (Q12)	530	−0.45	1.13	1.18
	Fatigue (Q17)	650	−1.39	1.16	1.18
	Dry and cracked heel (Q18)	448	0.08	1.09	1.12
	Night itch (Q19)	403	0.36	0.94	0.96
	Dull pain of the heel (Q20)	399	0.39	0.85	0.85
	Tinnitus (Q24)	438	0.14	1.32	1.32
	Hair loss (Q25)	445	0.09	1.02	1.07
	Rough skin (Q26)	484	−0.15	0.83	0.87
The second analysis	Night cough (Q1)	341	0.86	1.02	1.06
	Afternoon flush (Q5)	383	0.56	0.86	0.83
	Dry mouth (Q6)	486	−0.11	1.06	1.05
	Weakness of the lower limbs (Q8)	473	−0.03	0.75	0.75
	Dull pain of the ankle or knee (Q9)	494	−0.16	1.02	1.04
	Low back pain (Q10)	566	−0.65	0.97	0.95
	Frequent urination (Q12)	530	−0.40	1.19	1.24
	Fatigue (Q17)	650	−1.35	1.15	1.16
	Dry and cracked heel (Q18)	448	0.13	1.10	1.13
	Night itch (Q19)	403	0.43	0.96	0.99
	Dull pain of the heel (Q20)	399	0.45	0.83	0.84
	Tinnitus (Q24)	438	0.20	1.31	1.29
	Hair loss (Q25)	445	0.15	1.03	1.12
	Rough skin (Q26)	484	−0.10	0.81	0.85

MnSq, mean square. Bold letters indicate infit or outfit MnSq under 0.70 or over 1.40.