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Table 2 Newcastle-Ottawa Scale (NOS) quality assessment of the selected articles

From: The effects of varicocelectomy on the DNA fragmentation index and other sperm parameters: a meta-analysis

References Study design NOS Quality
Abdelbaki et al. [19]. Prospective 8 High
Alhathal et al. [20]. Prospective 8 High
Ghazi et al. [21]. Prospective 8 High
La Vignera et al. [22]. Prospective 8 High
Li et al. [23]. Prospective 8 High
Zini et al. [24]. Prospective 8 High
Smit et al. [25]. Prospective 8 High