Table 3.

Quality analysis

Article	Previous estimate of sample size	Selection description	Withdrawals	Valid method	Method error analysis	Blinding in measurements	Adequate statistics provided	Judge quality standard
Albogha H et al. [24]	Not	Adequate	Not known	Partly	Yes	Not	Yes	Low
Mucedero M et al. [35]	No/not known	Adequate	Not known	Yes	Yes	Not	Yes	Medium
Torres FC et al. [33]	No/not known	Adequate	Not known	Yes	Yes	Not	Yes	Medium
Cassis MA et al. [34]	Yes	Adequate	Not known	Yes	Yes	Not	Yes	Medium
Doshi UH et al. [23]	Not	Adequate	Not known	Partly	Yes	Not	No	Low
Giuntini V et al. [32]	Not	Adequate	Not known	Yes	Yes	Not	Yes	Medium
Cinsar A et al. [22] subgroup.	Not	Adequate	Not known	Yes	Yes	Not	Yes	Medium
Defraia E et al. [41]	Not	Adequate	Not known	Yes	Yes	Not	Yes	Medium
Cozza P et al. [30]	Not	Adequate	Not known	Yes	Yes	Not	Yes	Medium
Cozza P et al. [31]	Not	Adequate	Not known	Yes	Yes	Not	Yes	Medium
Pedrin F et al [27]	Not	Adequate	None	Partly	Yes	Not	Not	Low
Torres FC et al. [28]	Yes	Adequate	Not known	Partly	Yes	Not	Not	Medium
Cozza P et al. [29]	Not	Adequate	Not known	Partly	Yes	Not	Yes	Low
Işcan HN et al. [19]	Not	Adequate	Not known	Yes	Not	Not	Not	Low
Bazzucchi A et al. [21]	Not	Adequate	Not known	Not	Yes	Not	Not	Low
Işcan HN and Sarisoy L [20]	Not	Adequate	Not known	Partly	Yes	Not	Yes	Medium
Erbay E et al. [40]	Not	Adequate	Not known	Partly	Not	Not	Yes	Medium
Işcan HN et al. [19]	Not	Adequate	One	Yes	Yes	Not	Inadequate	Low
Weinbach JR and Smith RJ [39]	Not	Adequate	Not known	Not	Not	Not	Inadequate	Low
Kuster R and Ingervall B [18]	Not	Adequate	One	Yes	Yes	Not	Yes	Medium
Ngan P et al. [38]	Not	Adequate	Not known	Yes	Yes	Not	Inadequate	Low
Haydar B and Enacar A [37]	Not	Adequate	Not known	Partly	Not	Not	Yes	Medium
Kiliaridis S et al. [17]	Not	Adequate	Four	Partly	Yes	Yes	Absent	Low
Fränkel R [36]	Not	Adequate	Not known	Partly	Not	Not	Yes	Medium