Table 1.

General characteristics of included trials.

Study	Sample (T/C)	Age	Duration (year)	Symptom	Interventional time (premenstrual)	Control	Course of treatment (month)	Outcomes
Dong et al. 2014 [16]	15/15	18~23	NR	Q	14 days	Acupuncture	3	①
Ren 2013 [17]	40/40	16~28	1~8	H	3 days	Medicine	3	① ③
Zhang et al. 2011 [18]	14/14	15~24	0.5~6	NR	3 days	Medicine	3	① ③
Huang 2011 [19]	19/19	13~18	0.4~3	NR	5 days	Medicine	3	①
Li and Yan 2015 [20]	50/50	16~27	2~9	NR	5 days	Medicine	NR	②
Huang and Si 2015 [21]	38/38	15~27	0.5~5	NR	5 days	Medicine	3	①
Wen 2013 [22]	30/30	15~36	1~20	QH	7 days	Medicine	3	②
Bai 2013 [23]	69/64	13~35	NR	QH	7 days	Medicine	3	② ③
Zhu and Fei 2011 [24]	20/20	17~28	0.2~10	H	7 days	Medicine	3	①
Ji et al. 2011 [25]	20/20	18~24	1~10	NR	7 days	Acupuncture	3	①

NR = not reported; Q = qi stagnation and blood stasis; H = cold and damp accumulation; ① = effective rate; ② = pain assessment; ③ = PGF2α levels.