Table II.

Differences between preventability of death reviews (means with ranges as appropriate)

Review outcome	Errors	Age (yrs)	Time to operation (hrs)	ASA* Grade (Grade, reviews with ASA, %)
Unpreventable (n = 35)	5.7 (1 to 13)†	84.3 (67 to 96)	23.8 (2 to 52)	2:2 (9.5%)/3:12 (57.1%) /4:7 (33.3%)
Possibly preventable (n = 32)	9.1 (3 to 13)†	88.0 (67 to 96)	24.0 (2 to 52)	2:2 (8.0%)/3:18 (72.0%)/4:5 (20.0%)
Probably preventable(n = 13)	8.5 (2 to 12)†	86.5 (73 to 95)	24.2 (20 to 52)	2:0 (0%)/ 3:6 (60%)/4:4 (40%)

*ASA, American Society of Anesthesiologists † Kruskal–Wallis, p < 0.001