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Table 2 The risk of bias for the included studies (Newcastle-Ottawa scale)

From: Laparoscopic intersphincteric resection versus an open approach for low rectal cancer: a meta-analysis

Study Selection Comparability Outcome Total
  REC SNEC AE DO SC AF AO FU AFU  
Laurent [24] 1 0 1 1 0 0 1 1 1 6
Yamamoto [25] 1 1 1 1 1 1 1 0 1 8
Park [26] 1 1 1 1 0 0 1 1 1 7
Chi [18] 1 1 1 1 0 0 1 1 1 7
Fujimoto [28] 1 1 1 1 0 0 1 0 1 6
  1. REC representativeness of the exposed cohort, SNEC selection of the non-exposed cohort, AE ascertainment of exposure, DO demonstration that outcome of interest was not present at start of study, SC study controls for age and sex, AF study controls for any additional factors (chemoradiotherapy, curative resection), AO assessment of outcome, FU follow-up long enough for outcomes to occur, AFU adequacy of follow-up of cohorts