First-stage parameter estimates	Estimate		St. err.		Prob. Chi sq.
Intervention characteristics
CABG fixed effect		0.3562		0.0345		< 0.0001
ICD/CRT fixed effect		0.1698		0.0268		< 0.0001
NSTEMI fixed effect		0.5518		0.0300		< 0.0001
STEMI fixed effect		0.0000
CABG readmission fixed effect		− 3.3210		0.0249		< 0.0001
ICD/CRT readmission fixed effect		− 3.0581		0.0147		< 0.0001
NSTEMI readmission fixed effect		− 3.5410		0.0244		< 0.0001
STEMI readmission fixed effect		− 2.9202		0.0206		< 0.0001
Patient characteristics
Age		0.0125		0.0019		< 0.0001
Age × age		− 0.0001		0.0000		< 0.0001
Sex		− 0.0247		0.0062		< 0.0001
Therapy Anticoagulants Antiplatelet Anticoagulants × antiplatelet		− 0.1491 − 0.1014 − 0.0292		0.0094 0.0091 0.0117		< 0.0001 < 0.0001 0.0126
Elixhauser comorbidity groups (CABG, ICD/CRT)
Blood loss anemia		− 0.2172		0.0214		< 0.0001
Hypertension, complicated		0.0317		0.0081		< 0.0001
Hypertension, uncomplicated		0.1519		0.0128		< 0.0001
Chronic pulmonary disease		0.0334		0.0078		< 0.0001
Depression		− 0.0126		0.0079		0.1096
Drug abuse		− 0.2003		0.0220		< 0.0001
Weight loss		− 0.0177		0.0136		0.1922
Cardiac arrhythmia		− 0.0194		0.0110		0.0779
Valvular disease		− 0.0078		0.0079		0.3253
Congestive heart failure		− 0.0157		0.0083		0.0580
Psychoses		− 0.1566		0.0199		< 0.0001
Fluid and electrolyte disorders		− 0.1256		0.0101		< 0.0001
Hypothyroidism		− 0.0087		0.0086		0.3145
Metastatic cancer		0.1121		0.0180		< 0.0001
Solid tumor without metastasis		0.0349		0.0092		0.0001
Obesity		− 0.0442		0.0081		< 0.0001
AIDS/HIV		0.0195		0.0779		0.8026
Alcohol abuse		0.0403		0.0148		0.0066
Rheumatoid arthritis/collagen		− 0.0218		0.0089		0.0137
Diabetes, complicated		− 0.0684		0.0093		< 0.0001
Diabetes, uncomplicated		0.0108		0.0105		0.3024
Peripheral vascular disorders		− 0.0034		0.0079		0.6640
Coagulopathy		− 0.0818		0.0093		< 0.0001
Liver disease		− 0.0265		0.0083		0.0013
Pulmonary circulation disorders		− 0.0847		0.0117		< 0.0001
Lymphoma		− 0.0387		0.0233		0.0974
Paralysis		− 0.1239		0.0134		< 0.0001
Deficiency anemia		− 0.0635		0.0100		< 0.0001
Peptic ulcer disease, excluding bleeding		− 0.0573		0.0145		< 0.0001
Other neurological disorders		− 0.0070		0.0104		0.5012
Renal failure		− 0.0888		0.0084		< 0.0001
Ontario AMI prediction rules, distance (NSTEMI/STEMI)
Shock		0.1195		0.0398		0.0027
Diabetes with complications		− 0.0048		0.0112		0.6673
Congestive heart failure		− 0.1452		0.0108		< 0.0001
Cancer		0.0129		0.0111		0.2441
Cerebrovascular disease		− 0.0511		0.0106		< 0.0001
Pulmonary edema		− 0.2782		0.0464		< 0.0001
Acute renal failure		− 0.0787		0.0153		< 0.0001
Chronic renal failure		− 0.0584		0.0126		< 0.0001
Cardiac dysrhythmias		− 0.0176		0.0106		0.0960
Distance		− 0.0005		0.0004		0.2656
Hospital characteristics
Teaching hospital		0.0336		0.0250		0.1797
Private for-profit hospital		− 0.1737		0.0710		0.0144
Private not-for-profit hospital		− 0.0206		0.0525		0.6949
Public hospital		0.0306		0.0503		0.5432
Beds		− 0.0000		0.0001		0.89
Department admissions		0.0000		0.0000		< 0.0001
Department discharges		− 0.0000		0.0000		0.7357
Specialist doc		− 0.0001		0.0002		0.4384
Nurses		0.0000		0.0000		0.5551
Private for-profit hospital × beds		0.0001		0.0001		0.438
Private not-for-profit private × beds		0.0001		0.0001		0.4136
Public hospital × beds		− 0.0000		0.0001		0.9105
Teaching hospital × beds		− 0.0001		0.0000		0.0004
GRP inhabitant		− 0.0000		0.0000		< 0.0001
DE East		− 0.1180		0.1409		0.4022
DE West		− 0.8525		0.3190		0.0075
452 hospital fixed effects included

Note: The AFT model assumes that a covariate accelerates or decelerates the survival time by a constant. We applied a transformation for a better interpretation of coefficients’ magnitude [62]