Table 2.

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

	All registrants in NELA during study period (n = 129)	Study participants (n = 70)	Excluded from study (n = 59)	p value
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

^a Length of postoperative stay assessment capped at 60 days