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Table 2 Quality assessment of included studies by a revised 6-item scale

From: The combination of blue dye and radioisotope versus radioisotope alone during sentinel lymph node biopsy for breast cancer: a systematic review

Author (year) Description of patients’ characteristics Reasons for withdrawal Description of measures of outcomes Evaluation of confounding factors Description of the SLN technique Sample size over 300 Total score
Bass et al. (1999) [18] 0 0 1 1 1 1 4
Mariani et al. (2000) [28] 1 0 1 0 1 0 3
Rahusen et al. (2000) [30] 1 0 1 0 1 0 3
Derossis et al. (2001) [12] 1 0 1 1 1 1 5
Bauer et al. (2002) [19] 1 0 1 1 1 1 5
Pelosi et al. (2003) [29] 1 0 1 1 1 0 4
Fleming et al. (2003) [22] 1 0 1 1 1 0 4
Ahrendt et al. (2002) [17] 1 0 1 1 1 0 4
Tsunoda et al. (2002) [34] 0 0 1 1 1 1 4
Schirrmeister et al. (2004) [32] 1 0 1 0 0 1 3
Lauridsen et al. (2004) [24] 1 1 1 1 1 0 5
Mamounas et al. (2005) [27] 1 1 1 1 0 1 5
Takei et al. (2006) [33] 1 0 1 1 1 1 5
Argon et al. (2006) [1] 1 0 1 1 1 0 4
Low et al. (2006) [26] 1 1 1 1 1 0 5
Goyal et al. (2006) [23] 1 0 1 1 1 1 5
Lelievre et al. (2007) [25] 1 0 1 1 1 0 4
Rodier et al. (2007) [31] 1 1 1 1 1 1 6
Kang et al. (2010) [10] 1 0 1 1 0 1 4
Johnson et al. (2011) [8] 0 0 1 1 1 1 4
Kuehn et al. (2013) [3] 1 1 1 1 0 1 5
Elmadahm et al. (2015) [21] 1 0 1 1 1 1 5
O'Reilly et al. (2015) [11] 1 1 1 1 1 1 6
Boughey et al. (2013) [20] 1 1 1 1 1 1 6
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