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Table 2 Primary and Secondary Outcomes According to the Allocation Group

From: Intraoperative low tidal volume ventilation and the risk of ICD-10 coded delirium and the use for antipsychotic medications

  Low Tidal Volume
(n = 614)
Conventional Tidal Volume
(n = 592)
Absolute Difference
(95% CI)
p value
Primary outcome
  Delirium during hospital stay 68 (11.1) 67 (11.3) -0.24 (-3.82 to 3.32) 0.894
Key secondary outcome
  Delirium during hospital staya 68 (11.1) 67 (11.3) -0.24 (-3.82 to 3.32) 0.894
Secondary outcomes
  Number of doses of anxiolytic 3.5 (2.0 – 7.5) 3.0 (1.0 – 10.0) 0.66 (-1.58 to 2.90) 0.562
  Number of doses of antipsychotic 3.0 (2.0 – 6.0) 4.0 (1.5 – 10.5) -1.00 (-4.95 to 2.95) 0.622
  Total dose of antipsychotic 9.4 (3.0 – 20.9) 4.0 (2.5 – 30.0) 5.98 (-7.15 to 19.12) 0.376
  1. Data are presented as median (quartile 25—quartile 75) or N (%)
  2. Absolute difference is risk difference for primary and key secondary outcomes and median difference for secondary outcomes
  3. a Excluding diazepam from the definition