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Table 3 Risk factors for delirium

From: Is preoperative anxiety associated with postoperative delirium in older persons undergoing cardiac surgery? Secondary data analysis of a randomized controlled trial

Risk factor Unadjusted OR (95% CI) Adjusted OR (95% CI)
Main model a
 Treatment allocation 0.87 (0.49–1.55) 1.19 (0.61–2.32)
 Age 1.09 (1.04–1.15) 1.10 (1.03–1.18) *
 Mini-Mental State Examination 0.88 (0.77–1.01) 0.90 (0.77–1.06)
 Geriatric Depression Scale 1.05 (0.88–1.26) 1.04 (0.84–1.29)
 Katz ADL index 0.95 (0.73–1.25) 0.69 (0.50–0.96) *
 EuroSCORE 2 1.13 (1.06–1.21) 1.07 (0.99–1.15)
 Time on cardiopulmonary bypass 1.01 (1.00–1.02) 1.01 (1.00–1.02) *
 Diabetes mellitus 2.05 (1.05–3.97) 3.15 (1.42–7.00) *
 Postoperative infection 2.46 (1.23–4.93) 1.90 (0.87–4.12)
Anxiety measures b
 APAIS, anxiety score c 0.98 (0.91–1.06) 0.97 (0.88–1.07)
 APAIS, need for information score d 0.91 (0.81–1.03) 0.95 (0.83–1.10)
 Visual Analogue Scale, anaesthesia e 1.00 (0.99–1.02) 1.00 (0.99–1.02)
 Visual Analogue Scale, surgery f 0.99 (0.98–1.01) 1.00 (0.98–1.01)
  1. * Statistical significant at p < 0.05
  2. a Performance of the main model: Pseudo R2 = 0.17, C-index = 0.77, Discrimination slope = 0.21 GOF chi2 = 34.98, p = 0.760, Mean VIF = 1.18;
  3. b Anxiety measures were tested seperately in four different models: model 1 = Main model + APAIS anxiety score, model 2 = Main model + APAIS need for information score, model 3 = Main model + Visual Analogue Scale anaesthesia, model 4 = Main model + Visual Analogue Scale surgery
  4. c Performance of Main model + APAIS anxiety score (in comparison with main model): Δ R2 = 0, Δ C-index = 0, Δ Discrimination slope = 0; GOF chi2 = 5.88, p = 0.661
  5. d Performance of Main model + APAIS need for information score (in comparison with main model): Δ R2 = 0, Δ C-index = 0, Δ Discrimination slope = 0; GOF chi2 = 5.94, p = 0.654
  6. e Performance of Main model + Visual Analogue Scale anaesthesia (in comparison with main model): Δ R2 = 0, Δ C-index = 0, Δ Discrimination slope = 0; GOF chi2 = 7.03, p = 0.534
  7. f Performance of Main model + Visual Analogue Scale surgery (in comparison with main model): Δ R2 = 0, Δ C-index = 0, Δ Discrimination slope = 0; GOF chi2 = 6.56, p = 0.585
  8. Abbreviations: APAIS Amsterdam Preoperative Anxiety and Information Scale, ADL activities of daily living