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Table 2 Newcastle-Ottawa Scale for risk of bias assessment of the included studies

From: Comparison of overall survival and perioperative outcomes of laparoscopic pancreaticoduodenectomy and open pancreaticoduodenectomy for pancreatic ductal adenocarcinoma: a systematic review and meta-analysis

Study Design Selection Comparability Outcome Total
Representativeness of exposed cohort Selective of nonexposed Cohort Ascertainment of exposure Outcome not present at start Assessment of outcome Adequate follow-up length Adequacy of follow-up
Croome P *   * * * * * * 7
Speicher R *   * * * * * * 7
Sharpe R *   * *   * * * 6
Stauffer P * * * * * * * * 8
Champman R * * * * * * * * 8
Kantor R * * * * * * * * 8
Chen R * * * * * * * * 8
Dokmak P *   * * * * * * 7
  1. P Prospectively study, R Respectively study
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