Table 3. Feature importance ratios for the top-10 features and vaccine.

HOI	Feature	Feature importance ratio	Definition
Anaphylaxis	Age	30.31	AGE
	A02B	6.97	DRUGS FOR PEPTIC ULCER AND GASTRO-OESOPHAGEAL REFLUX DISEASE (GORD)
	M01A	5.82	ANTI-INFLAMMATORY AND ANTIRHEUMATIC PRODUCTS, NON-STEROIDS
	R06A	5.64	ANTIHISTAMINES FOR SYSTEMIC USE
	H02A	5.52	CORTICOSTEROIDS FOR SYSTEMIC USE, PLAIN
	Sex	5.31	SEX
	N02A	4.43	OPIOIDS
	A03F	4.33	PROPULSIVES
	N01B	3.78	ANESTHETICS, LOCAL
	M09A	3.75	OTHER DRUGS FOR DISORDERS OF THE MUSCULO-SKELETAL SYSTEM
	Vaccine	3.53	VACCINATION STATUS
Agranulocytosis	Age	18.43	AGE
	B05X	14.33	I.V. SOLUTION ADDITIVES
	B05B	10.82	I.V SOLUTIONS
	A04A	6.17	ANTIEMETICS AND ANTINAUSEANTS
	A02B	5.84	DRUGS FOR PEPTIC ULCER AND GASTRO-OESOPHAGEAL REFLUX DISEASE (GORD)
	H02A	5.64	CORTICOSTEROIDS FOR SYSTEMIC USE, PLAIN
	N02A	4.51	OPIOIDS
	Sex	4.04	SEX
	A03F	4.02	PROPULSIVES
	L01X	3.64	OTHER ANTINEOPLASTIC AGENTS
	…	…	…
	Vaccine	1.49	VACCINATION STATUS