Table 2: Methodological quality assessment of the included studies.

StudyRisk of bias domain Jadad score
Sequence generationAllocation concealmentBlindingIncomplete outcome dataSelective outcome reportingOther sources of biasOverall risk of bias

Pain reduction
Artkarn, 2006 [10]HHHLLHH 0
Chiranthanut et al., 
2014 [11]
LLHLLLL 3
Iampornchai et al.,  
2009 [12]
HHHLHLH 0
Intarasukum and Kerdcharoen,  
2011 [13]
LHHLLHH 2
Lekutai et al.,  
2008 [14]
HHHLLHH 1
Phromjuang,  
2010 [15]
HHHLLHH 1
Puengsuwan et al.,  
2009 [16]
LHHLLHH 2
Sathianrat et al.,  
2003 [17]
HHHLLHH 0
Sukonthasarn,  
2004 [18]
HHHLLHH 0
Suwan 2000 [19]HHHLLHH 0
Induce lactation
Listisit and Pakdeechot,  
2009 [20]
HHHLLHH 0
Pakdeechot et al.,  
2010 [21]
HHHLLHH 0
Trainapakul et al.,  
2010 [22]
HHHH LHH 1

H, high risk of bias; L, low risk of bias.