Table 4.

Definition of quality indicators

1. Variable completeness
Operationalization	The proportion of completed variables per hospital.
Numerator	The number of variables that are completed per patient.
Denominator	The total number of eligible variables per patient.
Definition	Variables used: date of birth, gender, type of fracture, type of treatment, ASA score, date and time of arrival at emergency department, date and time of surgery, consultation of geriatrician, date of discharge, type of anaesthesia, complications, Katz Index of Independence in Activities of Daily Living at admission, mobility score at admission, living situation before admission, reoperations, 3-month Katz Index of Independence in Activities of Daily Living at admission, 3-month mobility score, 3-month living situation.
Inclusion criteria	Patients older than 18 years with hip fracture who received an operative treatment.
Exclusion criteria	Patients not eligible for 3-month follow-up.
Inclusion period	1 January 2017–31 December 2017
2. Time to surgery
Operationalization	Median time to surgery from admission to the emergency department and start of surgery of ASA 1/2 and ASA 3/4 patients with a hip fracture.
Numerator	a. The number of ASA 1/2 patients operated within the audit median time difference in hours from admission to start of operation. b. The number of ASA 3/4 patients operated within the audit median time difference in hours from admission to start of operation.
Denominator	a. The total number of ASA 1/2 patients operated. b. The total number of ASA 3/4 patients operated.
Definition	–
Inclusion criteria	Patients older than 18 years with hip fracture who received an operative treatment.
Exclusion criteria	A time to surgery of > 120 h is defined as missing; hospitals with > 10% missing on the counter are excluded.
Inclusion period	1 January 2017–31 December 2017
3. Orthogeriatric management during admission
Operationalization	Orthogeriatric management during admission for operated hip fracture patients.
Numerator	Number of patients with orthogeriatric treatment during admission.
Denominator	Total number of operated hip fracture patients older than 70 years.
Definition	Orthogeriatric treatment: peri-operative collaboration between geriatrician and surgeon.
Inclusion criteria	Patients 7o years and older with a hip fracture who received an operative treatment.
Exclusion criteria	Missing data is treated as no orthogeriatric management; hospitals with > 10% missing on the counter are excluded.
Inclusion period	1 January 2017–31 December 2017