Appendix 2—table 1. Estimates of parameters shared by the age-specific VE and birth-cohort-specific VE models.

	Model with age-specific VE, age ≥6 months (MLE, 95% CI)	Model with age-specific VE, age ≥15 years (MLE, 95% CI)	Model with age-specific VE, age < 65 years (MLE, 95% CI)	Model with age-specific VE, age 15–64 years (MLE, 95% CI)	Model with birth-cohort- specific VE, age ≥15 years (MLE, 95% CI)
Imprinting protection (%)
H1	66 (53, 77)	48 (25, 66)	64 (47, 77)	43 (11, 66)	49 (24, 67)
H3	33 (17, 46)	41 (20, 56)	34 (18, 47)	36 (13, 52)	41 (20, 56)
N2	0 (0, 7)	0 (0, 11)	0 (0, 8)	0 (0, 10)	0 (0, 11)
Age-specific risk of medically attended influenza A infection
0–4 years	3.0 (2.5, 3.6)	N.A.	3.0 (2.5, 3.6)	N.A.	N.A.
5–9 years	2.6 (2.2, 3.0)	N.A.	2.5 (2.2, 3.0)	N.A.	N.A.
10–14 years	1.7 (1.4, 2.0)	N.A.	1.7 (1.4, 2.0)	N.A.	N.A.
15–19 years	1.2 (1.0, 1.5)	1.2 (1.0, 1.5)	1.2 (1.0, 1.5)	1.2 (1.0, 1.5)	1.2 (1.0, 1.5)
30–39 years	1.1 (0.9, 1.3)	1.1 (0.9, 1.3)	1.1 (0.9, 1.3)	1.1 (0.9, 1.3)	1.1 (0.9, 1.3)
40–49 years	0.9 (0.7, 1.1)	0.9 (0.8, 1.1)	0.9 (0.7, 1.1)	0.9 (0.8, 1.1)	0.9 (0.8, 1.1)
50–64 years	1.0 (0.8, 1.3)	1.0 (0.8, 1.2)	1.0 (0.8, 1.3)	1.0 (0.8, 1.2)	0.9 (0.7, 1.1)
65+ years	1.6 (1.2, 2.1)	1.4 (1.0, 1.9)	N.A	N.A.	1.5 (1.1, 1.9)