Table 1 Demographics
|  | Selenium (n = 123) | Placebo (n = 121) | p |
|---|---|---|---|
Baseline characteristics | Â | ||
 Age (years)—median (IQR) | 70 (60–76) | 71 (64–77) | 0.17 |
 Female/male—no. (%) | 29 (24)/94 (76) | 25 (21)/96 (79) | 0.58 |
 Germany/Canada—no. (%) | 93 (76)/30 (24) | 92 (76)/29 (24) | 0.94 |
 Body mass index—median (IQR) | 27 (25–30) | 28 (25–30) | 0.95 |
 Charlson comorbidity index—median (IQR) | 1 (0–2) | 1 (0–2) | 0.41 |
 Clinical frailty score—median (IQR) | 3 (2–3) | 3 (2–3) | 0.34 |
Baseline chemistry | Â | ||
 GFR (ml/min/1.73 m2)—median (IQR) | 82 (68–97) | 81 (69–97) | 0.85 |
 Creatinine (µmol/l)—median (IQR) | 84 (73–101) | 86 (72–103) | 0.94 |
 Interleukin-6 (pg/ml)—median (IQR) | 44 (32–49) | 36 (22–62) | 0.92 |
Operative characteristics | Â | ||
 EuroSCORE II—median (IQR) | 9 (6–16) | 8 (6–14) | 0.45 |
 Elective/urgent surgery—no. (%) | 96 (78)/27 (22) | 97 (80) / 24 (20) | 0.68 |
 Cardiopulmonary bypass (min)—median (IQR) | 140 (113–178) | 141 (102–190) | 0.90 |
Baseline micronutrient status | Â | ||
 Selenium (µg/l)—median (IQR) | 68 (55—114) | 65 (52–119) | 0.67 |
 Deficiency (< 70 µg/l)—no. (%) | 64 (52) | 64 (53) | 0.73 |
 SELENOP (mg/l)—median (IQR) | 4.5 (3.4–5.7) | 4.7 (3.5–6.0) | 0.75 |
 GPx3 (U/l)—median (IQR) | 273 (187–299) | 253 (204–289) | 0.62 |