Coverage of PHC interventions according to vaccination status of the child, stratified by country-specific wealth quintiles, averaged over 91 countries. Each dot represents a wealth quintile. PHC – primary health care. DHS – Demographic and Health Surveys. MICS – Multiple Indicator Cluster and Surveys. DPT – diphtheria, pertussis, tetanus vaccine. No vaccination refers to lack of any BCG, DPT, polio and MCV doses. ANC – antenatal care. SII – Slope Index of Inequality. The x-axis shows the vaccination coverage. In the y-axis (left side) are shown children who received no DPT vaccination and who received at least one dose of DPT vaccine, also children who received no vaccinations and who received at least one dose of BCG, DPT, polio, or MCV. On the right side of the figure is shown the SII - Note: Cuba was excluded due to lack of wealth index information. The Slope Index of Inequality (SII) is a measurement of absolute inequality that represents the predicted difference in service coverage between the extremes of the wealth distribution. The farther values are from zero, the larger the absolute inequalities.