Table 3

Summary statistics of patients

Patient characteristics	Total	No PSE	PSE^†	p Value^*
Count of patient safety events	48 418	29 249	19 169	---
		60%	40%	---
Patient characteristics
Average total charges (dollars)	18 493.36	11 268.06	29 518.90	0.000
SE	153.13	74.18	355.39
Average length of stay (days)	5.59	3.71	8.46	0.000
SE	0.04	0.27	0.10
Mean age	42.61	40.12	46.40	0.000
SE	0.11	0.14	0.17
Complexity (scale=1–4) (%)
0 (levels 1 and 2)	60.88	73.24	42.03	0.000
1 (levels 3 and 4)	39.12	26.76	57.97
Sex (%)
Male	49.23	49.17	49.32	0.685
Female	50.76	50.82	50.68
Race (%)
Caucasian	54.54	50.44	60.81	0.000
African–American	40.04	44.00	33.99
Other	5.41	5.56	5.2

↵* p Values calculated using t tests for continuous variables or χ² test for categorical variables.
↵† Includes non-preventable events such as adverse drug events and complications of care. PSE total contains duplicate events.
PSE, patient safety event.