The Study of Dynamic Characteristic of Acupoints Based on the Primary Dysmenorrhea Patients with the Tenderness Reflection on Diji (SP 8)

Table 3

Comparison of VAS score between menstrual and nonmenstrual period in two groups (mm).

Group		Menstrual period	Nonmenstrual period
Observation group	Number of effective values	53	38	−2.646	0.0081
	Minimum value	10	5
	Maximum value	60	40
	M (QR)	30 ()	22.5 ()^*
	Mean rank	88.76	66.12
Control group	Number of effective values	31	19	−0.182	0.856
	Minimum value	5	5
	Maximum value	40	40
	M (QR)	20 ()^*	20 ()
	Mean rank	54.89	57.50
		−3.705	−0.780
		0.000	0.436

Note: corrected value . ^*Compared with observation group in menstrual period, .