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Table 1 Demographic and baseline characteristics

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

  Sample n = 190 Delirious n = 78 Non-delirous n = 112 OR (95% CI)
Age, mean (SD) 75.7 (5.9) 77.4 (5.8) 74.5 (5.6) 1.09 (1.04–1.15)
Male gender, n (%) 99 (52.1) 43 (55) 56 (50) 1.22 (0.69–2.19)
Living situation, n (%)
 Alone 50 (26.3) 21 (26.9) 29 (25.9) 1.05 (0.55–2.03)
 Together 140 (73.7) 57 (73.1) 83 (74.1) 0.95 (0.49–1.83)
Educational level, n (%)
  < age 15 78 (41.3) 35 (44.9) 43 (38.7) 1.95 (0.82–4.63)
 Age 16–18 77 (40.7) 33 (42.3) 44 (39.6) 0.92 (0.49–1.74)
 College or university 34 (18.0) 10 (12.8) 24 (21.6) 0.51 (0.22–1.21)
Treatment allocation, n (%)
 Intervention 94 (49.5) 37 (47.4) 57 (50.9) 0.87 (0.49–1.55)
Anxiety measures
 APAIS-A score (4–20), mean (SD) 9.1 (3.8) 8.9 (43.8) 9.2 (3.8) 0.98 (0.91–1.06)
 APAIS-A score ≥ 11, n (%) 59 (31.1) 21 (26.9) 38 (33.9) 0.72 (0.38–1.35)
 APAIS-NFI (2–10), mean (SD) 5.4 (2.5) 5.0 (2.4) 5.6 (2.5) 0.91 (0.81–1.03)
 APAIS-NFI score ≥ 5, n (%) 111 (58.4) 42 (53.9) 69 (61.6) 0.73 (0.40–1.31)
 VAS-A for Anaesthesia (0–100), median (IQR) 24 (39) 25 (42) 22 (39.5) 1.00 (0.99–1.02)
 VAS-A for Surgery (0–100), median (IQR) 37 (42) 37.5 (43) 37 (42) 0.99 (0.98–1.01)
Pre-operative Mini-Mental State Examination score (0–30), mean (SD) 27.8 (2.1) 27.5 (1.9) 28.0 (2.2) 0.88 (0.77–1.01)
Geriatric Depression Scale (0–10), median (IQR) 1 (2) 1 (2) 1 (2) 1.05 (0.88–1.26)
Katz ADL index (0–12), median (IQR) 0 (0) 0 (0) 0 (0) 0.95 (0.73–1.25)
Smoking status (Yes), n (%) 12 (6.3) 4 (5.1) 8 (7.1) 1.13 (0.83–1.52)
Drinking status (Yes), n (%) 70 (36.8) 23 (29.5) 47 (42.0) 0.68 (0.40–1.16)
Diabetes mellitus (Yes), n (%) 48 (25.3) 26 (33.3) 22 (19.6) 2.05 (1.05–3.97)
25-hydroxy vitamin D (25-OHD) (nmol/l), median (IQR) 22.4 (15.2) 20.7 (12.6) 24.2 (18.9) 0.98 (0.92–1.04)
  1. Legend: APAIS Amsterdam Preoperative Anxiety and Information Scale, APAIS-A Anxiety subscale of APAIS scale, APAIS-NFI need for information subscale of APAIS scale, VAS-A Visual Analogue Scale for anxiety, ADL activities of daily living, IQR interquartile range