Table 2 NELA registrant and study participant characteristics. Values are number (proportion) or median (IQR [range])

Age

66 (50.5–76.5 [21.0–89])

65.5 (50–76 [21–89])

66 (56–77 [22–88])

0.574

P-Possum mortality risk pre-op (%)

5.7 (2.6–20.1 [0.7–98.5])

4.6 (1.8–15.6 [0.7–83.9])

8.8 (4.1–31.8 [0.8–98.5])

0.006

P-Possum morbidity risk pre-op (%)

69.0 (47.5–90.6 [17.5–100])

62.1 (39.2–86.0 [17.5–99.4])

83.5 (59.1–94.5 [19.9–100])

0.004

NELA mortality risk pre-op (%)

3.7 (1.2–11.6 [0.1–88.9])

3.3 (0.9–10.0 [0.1–61.3])

4.1 (1.6–18.9 [0.3–88.9])

0.094

ASA physical status

3 (2–3 [1–5])

3 (2–3 [1–5])

3 (2–3 [1–5])

0.086

Female patient

55 (42.6)

33 (47.1)

22 (37.3)

0.287

Critical care stay (days)

2 (2–4 [0–52])

2 (2–4 [0–15])

2 (2–5 [2–52])

0.383

Return to theatre

10 (7.8)

6 (8.6)

4 (6.8)

0.754

Postop LOS hospital (days)^a

9.8 (5.5–19.4 [0–60])

9.3 (6.0–23.7 [0–60])

11.3 (5.4–17.9 [0–60])

0.919

Observed In-hospital mortality

13 (10.1)

4 (5.7)

9 (15.3)

0.085