Table 3.

Patients with Clinically Meaningful Improvement.

Variable	Tai Chi Group (N = 33)	Control Group (N = 33)	P Value*
	no. of patients (%)
FIQ score†
Week 12	26 (78.8)	13 (39.4)	0.001
Week 24	27 (81.8)	17 (51.5)	0.009
Patient’s global assessment‡
Week 12	18 (54.5)	9 (27.3)	0.02
Week 24	18 (54.5)	9 (27.3)	0.02
PSQI score§
Week 12	13 (39.4)	4 (12.1)	0.01
Week 24	15 (45.5)	6 (18.2)	0.02
CES-D score¶
Week 12	24 (72.7)	16 (48.5)	0.04
Week 24	23 (69.7)	13 (39.4)	0.01
SF-36 scores||
Physical component
Week 12	18 (54.5)	5 (15.2)	0.001
Week 24	17 (51.5)	5 (15.2)	0.002
Mental component
Week 12	14 (42.4)	8 (24.2)	0.12
Week 24	16 (48.5)	8 (24.2)	0.04

^*P values were calculated with the use of the chi-square test.

^†A change in the score on the Fibromyalgia Impact Questionnaire (FIQ) of 14% (or 8.1 units) indicates clinically meaningful improvement.³⁰

^‡A reduction of 30% (or 2 points) on a visual-analogue scale indicates clinically meaningful improvement.³¹

^§A change of greater than 5 in the total score of the Pittsburgh Sleep Quality Index (PSQI) indicates clinically meaningful disturbed or poor sleep.²⁴

^¶A reduction of 10% (or 6 points) on the Center for Epidemiologic Studies Depression (CES-D) index indicates a clinically significant change.³²

^||On follow-up, changes of 6.5 points on the SF-36 physical-component scale and of 7.9 points on the mental-component scale indicate clinically meaningful improvement.²⁸,³³