Income level (as of 2013)
|
Polio vaccine(s) used (as of 2013)
|
Population size in billions (as of 2013)
|
Years until OPV use startsb
|
Year until IPV-only or IPV/OPV startsb
|
Number of assigned blocks
|
Number of blocks assigned to each R0 (for WPV1)
|
---|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
11
|
12
|
13
|
---|
Low
|
OPV-only
|
0.86
|
33
|
N/A
|
8
|
0
|
0
|
0
|
0
|
0
|
1
|
3
|
2
|
1
|
1
|
Lower middle
|
OPV-only
|
2.48
|
33
|
N/A
|
25
|
0
|
0
|
1
|
4
|
5
|
2
|
0
|
10
|
1
|
2
|
Upper middle
|
OPV-only
|
1.87
|
20
|
N/A
|
19
|
0
|
0
|
1
|
16
|
2
|
0
|
0
|
0
|
0
|
0
|
Upper middle
|
IPV/OPV
|
0.50
|
20
|
58
|
7
|
0
| |
2
|
3
|
2
|
0
|
0
|
0
|
0
|
0
|
High
|
IPV/OPV
|
0.23
|
10
|
50
|
2
|
0
|
0
|
0
|
2
|
0
|
0
|
0
|
0
|
0
|
0
|
High
|
IPV-only
|
1.02
|
10
|
50
|
10c
|
2
|
7.7
|
0.3
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
- aDoes not include countries with unspecified income level totaling approximately 23 million people and two high-income countries that still use OPV-only totaling approximately 34 million people (all as of 2013); Assigns 67 million people in IPV/OPV-using lower middle-income countries to IPV/OPV-using upper middle-income blocks, 74 million people in IPV-only using upper middle-income countries to IPV-only-using high-income blocks, and 23 million people in OPV-only-using high-income countries to OPV-using lower or upper middle-income blocks
- bYears relative to beginning of burn-in period 65 years ago (i.e., 1950)
- cIncludes some blocks with subpopulations assigned to different R0 values