Fig. 2From: The role of supportive supervision using mobile technology in monitoring and guiding program performance: a case study in Nigeria, 2015–2016Average time spent on supportive supervision for routine immunization (RI) and surveillance; supportive supervision data 2015–2016, Nigeria. NCZ north-central zone, NEZ northeast zone, NWZ northwest zone, SEZ southeast zone, SSZ south-south zone, SWZ southwest zoneBack to article page