x = intercept + 0.02 × age + ASA coefficient + functional-status coefficient + creatinine coefficient + surgery coefficient.

Predictor	Category or encoding	Coefficient
Intercept	Constant	−5.25
Age	Years	0.02
Functional status	Totally independent	0.00
	Partially dependent	0.65
	Totally dependent	1.03
ASA physical status class	Class I - normal healthy patient	−5.17
	Class II - mild systemic disease	−3.29
	Class III - severe systemic disease	−1.92
	Class IV - severe systemic disease that is a constant threat to life	−0.95
	Class V - moribund patient not expected to survive without surgery	0.00
Serum creatinine category	Normal (≤1.5 mg/dL or ≤133 µmol/L)	0.00
	Elevated (>1.5 mg/dL or >133 µmol/L)	0.61
	Unknown	−0.10
Surgery type	Hernia (ventral, inguinal, femoral)	0.00
	Anorectal (anus and rectum)	−0.16
	Aortic surgery	1.60
	Bariatric surgery	−0.25
	Brain surgery	1.40
	Breast surgery	−1.61
	ENT (except thyroid/parathyroid)	0.71
	Foregut or hepatopancreatobiliary	1.39
	Gallbladder, appendix, adrenals or spleen	0.59
	Intestinal (below duodenum)	1.14
	Neck (thyroid/parathyroid)	0.18
	Obstetric or gynaecologic	0.76
	Orthopaedic and non-vascular extremity	0.80
	Other abdominal	1.13
	Peripheral vascular (non-aortic)	0.86
	Skin	0.54
	Spine	0.21
	Thoracic (non-oesophageal, non-cardiac)	0.40
	Vein surgery	−1.09
	Urology (kidneys and urinary tract)	−0.26

30-day MICA risk (%) = 100 × exp(x) / [1 + exp(x)].

Gupta Perioperative Risk for Myocardial Infarction or Cardiac Arrest (MICA)