Table 4.

Primary study endpoints by treatment group (C).

	Acupuncture intervention N = 28	Lifestyle only intervention N = 28	p value	Adjusted analysis	RR/CI (CI 95%)
Incidence of menstrual clots (%)
None
M entry n = 56	10 (35.7)	9 (32.1)	M entry 0.556		1.11 (0.53, 2.31)
M1 n = 39	11 (45.8)	11 (73.3)	M1 0.221		0.63 (0.37, 1.06)
M2 n = 28	9 (47.4)	7 (77.8)	M2 0.287		0.61 (0.34, 1.1)
M3 n = 13	6 (85.7)	4 (66.7)	M3 0.188		2.14 (0.95, 4.85)
Small
M entry n = 56	12 (42.9)	9 (32.1)			1.33 (0.67, 2.65)
M1 n = 39	8 (33.3)	3 (20)			1.67 (0.52, 5.31)
M2 n = 28	7 (36.8)	1 (11.1)			3.32 (0.48, 23.06)
M3 n = 13	1 (14.3)	0
Large
M entry n = 56	6 (21.4)	9 (32.1)			0.67 (0.27, 1.62)
M1 n = 39	5 (20.8)	1 (6.7)			3.13 (0.4, 24.22)
M2 n = 28	3 (15.8)	1 (11.1)			1.42 (0.17, 11.83)
M3 n = 13	0	2 (33.3)
Variable
M entry n = 56	0	1 (3.6)
Incidence of menstrual pain
M entry n = 56	23 (82.1)	20 (71.4)	0.342		1.15 (0.86, 1.54)
M1 n = 40	17 (68)	5 (33.3)	0.033∗	0.056	2.04 (0.95, 4.38)
M2 n = 30	10 (50)	3 (30)	0.297	0.430	1.67 (0.59, 4.73)
M3 n = 13	2 (28.6)	3 (50)	0.529		0.67(0.17, 2.67)
Length of menstrual pain (mean (SD))
M entry n = 56	1.7 (1.6)	1.2 (1.0)	0.669
M1 n = 40	1.46 (1.7)	0.63 (1.4)	0.108	0.238	0.83 (−0.2, 1.86)
M2 n = 36	0.9 (1.2)	0.47 (1.1)	0.271	0.258	0.43 (−0.36, 1.22)
M3 n = 15	0.57 (0.5)	0.63 (1.1)	0.906	0.587	−0.06 (−1.02, 0.9)
Intensity of menstrual pain (mean (SD))
M entry n = 56	3 (1.3)	2 (1.4)	0.261
M1 n = 23	3 (1.3)	2 (1.4)	0.146	0.285	1 (−0.37, 2.37)
M2 n = 14	1.91 (1.4)	2.67 (1.5)	0.423	0.141	−0.76 (−2.76, 1.24)
M3 n = 7	1.5 (1.0)	2.67 (1.5)	0.272	0.840	−1.17 (−3.6, 1.26)

∗ indicates possible statistical significance, for example, p < 0.05.