Table 3.

Search strategy used in CNKI

Number	Search items
1 Related to intervention	少腹逐瘀汤
2	Shaofu Zhuyu decoction
3	Shaofu Zhuyu formula
4	Shaofu Zhuyu tang
5	1 or 2–5
6 Related to disease	痛经
7	原发性痛经
8	月经痛
9	经期腹痛
10	经痛
11	Dysmenorrhea
12	Primary dysmenorrhea
13	Menstrual disorder
14	Pelvic pain
15	Menstruation disturbances
16	6 or 7–15
17 Related to study design	随机
18	对照
19	临床研究
20	Controlled trial
21	Randomized controlled trial
22	17 or 18–22
23	6 and 16 and 22