Table A1 Screening criteria applied in stage 1 to 3983 records of deceased patients and 3943 records of discharged patients and the proportion of hospital admissions positive for each criterion*

Criteria	Description	Deceased patients†(%)	Discharged patients† (%)	Total sample‡ (%)
1	Unplanned admission before index admission (admission reasons are related to the index admission)	24	15	15
2	Unplanned readmission after discharge from index admission	0	13	12
3	Hospital-incurred patient injury (permanent or temporary injury obtained (acquired) during index admission)	16	7	7
4	Adverse drug reaction	7	4	4
5	Unplanned transfer from general care to (an) intensive care (unit)	13	2	2
6	Unplanned transfer to another acute care hospital (after unexpected deterioration of the patient)	0	0	0
7	Unplanned return to the operating room	7	3	3
8	Unplanned removal, injury or repair of organ during surgery	4	2	2
9	Hospital-acquired infection or sepsis	21	6	7
10	Other patient complication	16	3	3
11	Development of neurological deficit not present on admission	5	1	1
12	Unexpected death	47	0	2
13	Cardiac or respiratory arrest	4	0	0
14	Injury related to abortion or delivery	0	0	0
15	Inappropriate discharge to home	0	1	0
16	Dissatisfaction with care documented in the medical record	6	3	4
17	Documentation or correspondence indicating litigation	3	1	1
18	Any other undesirable outcome not covered above	13	8	9
Percentage of records with screening criteria		70	39	54

*More than one criterion could be identified for one hospital admission.
†Weighted for oversampling of patients admitted to a university hospital.
‡Weighted for oversampling of deceased patients and of patients admitted to a university hospital.