Table 2.

Factors That Are Varied in the Analysis

Analysis Variables	Description	Calculation	Rangea
Maximum R0	Reproduction number in immunologically naive population	c/γ0	4–20 (26)
OPV transmissibility	Transmissibility relative to WPV (%)	ɛ/κ	0%–20% (26)
Susceptibility waning rate	Exponential waningb		0.04, 0.07, and 0.1/yearc,d
φj	Effective vaccination rates in children (0–5 years of age)		0–3/year (1, 23)

Abbreviations: OPV, oral polio vaccine; WPV, wild poliovirus.

^a Upper and lower bounds were selected as biologically plausible limits.

^b See Web Appendix 4.

^c Waning rate values are not well defined and were, therefore, chosen to examine the impact of waning on the dynamics for wide-ranging outcomes. Additional values are explored in Web Appendices 5.1 and 5.3.

^d The susceptibility waning rates, 0.04, 0.07, and 0.1 per year, correspond to reaching 50% susceptibility after 17, 10, and 7 years, respectively.