Table 1. Summary of the multiple imputation process and the basic characteristics of the patients before and after multiple imputations (N=3,075).

BMI, body mass index; GCS, Glasgow Coma Scale; ISS, Injury Severity Score

	Cases missing, N (%)	Before imputation, median (25-75% quartiles) or N (%)	After imputation, median (25-75% quartiles) or N (%)
Age	0 (0%)	43 (28 to 61)	43 (28 to 61)
Sex (male)	0 (0%)	1775 (73.6%)	1775 (73.6%)
BMI	1459 (47.4%)	25 (22 to 27)	Not performed
GCS	42 (1.4%)	6 (3 to 15)	6 (3 to 15)
ISS	1 (<0.1%)	27 (22 to 38)	27 (22 to 38)
pH	833 (27.1%)	7.33 (7.26 to 7.38)	7.33 (7.26 to 7.39)
Base excess (mmol/L)	704 (22.9%)	-3 (-6 to -0.8)	-3.1 (-6.3 to -0.7)
Lactate (mmol/L)	473 (15.4%)	2.3 (1.4 to 3.6)	2.3 (1.4 to 3.8)
72-hour mortality	0 (0%)	687 (22.3%)	687 (22.3%)