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Table 1 Systematic review study characteristics

From: A core outcome set for studies evaluating interventions to prevent and/or treat delirium for adults requiring an acute care hospital admission: an international key stakeholder informed consensus study

N = 183 studies n (%)
Study design
 RCT 128 (70)
 Before and after intervention study 29 (16)
 Non-randomized controlled trial 19 (10)
 Othera 7 (4)
Study region
 North America 58 (32)
 Europe 52 (28)
 Asia 50 (27)
 Oceania 15 (8)
 Euroasia 5 (3)
 South America 2 (1)
 Multiple 1 (1)
Study population
 Adults only 183 (100)
 Older adults only 150 (88)
Patient type
 Surgical 109 (60)
 Medical 68 (37)
 Both 6 (3)
Delirium as a study objective
 Primary 137 (75)
 Secondary 46 (25)
Study intervention aim
 Prevention only 125 (68)
 Treatment only 18 (10)
 Both 44 (22)
Study intervention
 Pharmacological agent to prevent and/or treat delirium 87 (48)
 Protocol or bundle to prevent and/or treat delirium 80 (44)
 Non-pharmacological to prevent and/or treat delirium 16 (9)
  1. aOther comprised: 5 interventional cohort studies with controls, 1 quasi RCT, and 1 interrupted time series study
  2. Percentages may not sum to 100 due to rounding