Fig. 2.
Participation in polio supplementary immunization activities (SIAs) in non-polio-endemic sub-Saharan African countries, by use or non-use of routine immunization (RI) servicesa
*P < 0.01; **P < 0.05; ***P < 0.10 (for differences in participation between RI service users and non-users, by logistic regression analysis).
a SIAs appear in chronological order, moving clockwise, starting with the 1999 Burundi SIA. Data denote the adjusted proportions of children participating in an SIA among RI users (defined as children who owned a health card containing their vaccination history) and non-RI users (defined as children who did not own a health card). Full results including estimates of coefficients for covariates are shown in Appendix B (available at: http://www.columbia.edu/~sh2813/appendix-02292012sh.pdf).
