Table 2.

Characteristics of included studies.

Included study (year)	Study country	Number of subjects (E/C)	Intervening measure (E)	Duration (day)
Chen, 2017	China	47/40	Plus acupuncture on the basis of the control group	30
Deng, 2019a	China	25/25	Plus acupuncture on the basis of the control group	30
Deng, 2019b	China	30/30	Plus acupuncture on the basis of the control group	14
Du, 2015	China	45/45	Plus acupuncture on the basis of the control group	14
Fang, 2019	China	40/40	Plus acupuncture on the basis of the control group	30
Li, 2016	China	35/35	Plus acupuncture on the basis of the control group	10
Liu, 2018	China	40/40	Plus acupuncture on the basis of the control group	30
Qu, 2014	China	26/25	Plus acupuncture on the basis of the control group	14
Shen, 2013	China	30/30	Plus acupuncture on the basis of the control group	14
Xia, 2019	China	48/47	Plus acupuncture on the basis of the control group	28
Xiao, 2010	China	50/35	Plus acupuncture on the basis of the control group	14
Xie, 2018	China	38/38	Plus acupuncture on the basis of the control group	5
Yu, 2013a	China	40/40	Plus acupuncture on the basis of the control group	8
Yu, 2013b	China	21/21	Plus acupuncture on the basis of the control group	14
Zhang, 2014	China	30/30	Plus acupuncture on the basis of the control group	30

Note: E/C = experimental/control group.