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Table 1 The quality review system for included trials.

From: Strategies for prevention of postoperative delirium: a systematic review and meta-analysis of randomized trials

  Item Score Criteria
   2 Randomization is described and adequate (random numbers, computer generated, etc.)
  Randomization 1 Randomization is described
   0 No or inappropriate randomization
  Allocation 2 Allocation concealment is described and adequate (sequentially numbered opaque sealed envelopes, central randomization, etc.)
  concealment 1 Allocation concealment is described
Adapted Jadad score   0 No or inappropriate allocation concealment
  Intervention 2 Blinding is described and adequate
  blinding 1 Blinding is described
   0 No or inappropriate blinding
  Withdrawal or 1 Withdrawals and dropouts are described
  dropouts 0 Withdrawals or dropouts are not described
  Intention-to-treat 1 ITT analysis is used
  (ITT) analysis 0 ITT analysis is not used
  Similar groups at baseline 1 Delirium-related factors (age, sex, pre-existing cognitive or sensory deficit, physical functional status, comorbid diseases, medications and alcohol consumption [12, 15, 16]) are similar between groups
   0 Delirium-related factors are not screened or different
Delirium specific score Delirium assessor blinding 1 Delirium assessor is blinded to the interventions
    Delirium assessor is not blinded to the interventions
   2 Frequency: ≥ 1/day since postoperative day (POD) 1 and duration: > 3 days since POD 1 [1, 14]
  Delirium follow-up 1 Frequency: ≥ 1/day since POD 1 and duration: POD 1-3
   0 Frequency: < 1/day or duration < 3 days since POD 1