| | Study | Sample size | EA | Control | Duration | Outcome |
| | Liu et al., 2011 | E: 49
C1: 49
C2: 48
C3: 48 | at SP6, 2/100 Hz, 30 min
0.5–1.6 mA, HANS-200 | C1: at GB39, 2/100 Hz, 30 min
C2: nonacupoints, 2/100 Hz, 30 min
C3: waiting-list | Once/day, for 3 days | VAS, VRS, RSS |
| | Liu et al., 2014 | E: 167
C1: 167
C2: 167 | at SP6, 2/100 Hz, 30 min
0.5–1.6 mA, HANS-200 | C1: at GB39, 2/100 Hz, 30 min
C2: nonacupoints, 2/100 Hz, 30 min | Once/day, for 3 days | VAS, VRS, RSS |
| | Liu, 2016 | E: 50
C: 50 | at ST34 and ST36, 30 min
G6805-2 | C: Tianqi Tongjing Capsule | 5 days/MC, for 3 MCs | Curative rate |
| | Ma et al., 2010 | E1: 13
C1: 14
C2: 12
C3: 13 | at SP6, 2/100 Hz, 30 min
HANS-200 | C1: at GB39, 2/100 Hz, 30 min
C2: nonacupoints, 2/100 Hz, 30 min
C3: waiting-list | Once/day, for 3 days | VAS, VRS, RSS,
uterine arteries hemodynamics |
| | Ren and Zhuang, 2010 | E: 30
C: 30 | at SP6 and BL32, 2/100 Hz, 30 min
2–5 mA, G6805-B | C: ibuprofen 600 mg/day | 5 days/MC, for 3 MCs | Curative rate,
uterine arteries hemodynamics |
| | Shi et al., 2011 | E1: 10
C1: 10
C2: 10
C3: 10 | at SP6, 2/100 Hz, 30 min
LH202H | C1: at GB39, 2/100 Hz, 30 min
C2: nonacupoints, 2/100 Hz, 30 min
C3: waiting-list | 1 day | VAS, plasm PG |
| | Song et al., 2015 | E1: 163
C1: 165
C2: 164 | at SP6, 2/100 Hz, 30 min
HANS-200 | C1: at GB39, 2/100 Hz, 30 min
C2: nonacupoints, 2/100 Hz, 30 min | Once/day, for 3 days | VAS, RSS |
| | Xin et al., 2014 | E1: 125
C1: 123
C2: 120 | at SP6, 2/100 Hz, 30 min
HANS-200 | C1: at GB39, 2/100 Hz, 30 min
C2: nonacupoints, 2/100 Hz, 30 min | 1 day | VAS |
| | Zhi, 2007 | E: 57
C: 57 | at SP6, 60 Hz, 30 min
G6805-2A | Ibuprofen 600 mg/day | 5 days/MC, for 3 MCs | Curative rate |
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