Your answer is in the study[1] (see section 1D) which was modeled to align broadly with the Rwanda Demographic and Health Survey[2]<p>[1] <a href="http:&#x2F;&#x2F;www.sciencemag.org&#x2F;content&#x2F;suppl&#x2F;2015&#x2F;11&#x2F;24&#x2F;350.6264.1073.DC1&#x2F;Blumenstock.SM.pdf" rel="nofollow">http:&#x2F;&#x2F;www.sciencemag.org&#x2F;content&#x2F;suppl&#x2F;2015&#x2F;11&#x2F;24&#x2F;350.6264....</a><p>[2] <a href="http:&#x2F;&#x2F;dhsprogram.com&#x2F;publications&#x2F;publication-FR259-DHS-Final-Reports.cfm" rel="nofollow">http:&#x2F;&#x2F;dhsprogram.com&#x2F;publications&#x2F;publication-FR259-DHS-Fin...</a>