Table 1.

Basic characteristics of the models investigated^a

	POLYMOD	Roxanne	CoRoVa
Developers	HPA	GSK	University Groningen
Funding	EU	GSK	SPMSD
Software platform	Excel	Excel	Excel
Dynamic vs. static	Static	Statistic	Static
Deterministic vs. stochastic	Deterministic	Deterministic	Deterministic
Open vs. closed	Open	Closed	Closed
Cohort vs. population-based	Multi-cohort	Cohort	Cohort
Special features	Stepwise waning	Breastfeeding effects modeled	In- between dose efficacies modeled

^aSpecific questions regarding the three models should be attended to Dr Raymond Hutubessy (email address: hutubessyr@who.int)