Survey ID Number
NGA_2021_MIS_v01_M
Title
Malaria Indicator Survey 2021
Sampling Procedure
The sample for the 2021 NMIS was designed to provide most of the survey indicators for the country as a whole, for urban and rural areas separately, and for each of the country’s six geopolitical zones, which include 36 states and the Federal Capital Territory (FCT). Nigeria’s geopolitical zones are as follows:
• North Central: Benue, Kogi, Kwara, Nasarawa, Niger, Plateau, and FCT
• North East: Adamawa, Bauchi, Borno, Gombe, Taraba, and Yobe
• North West: Jigawa, Kaduna, Kano, Katsina, Kebbi, Sokoto, and Zamfara
• South East: Abia, Anambra, Ebonyi, Enugu, and Imo
• South South: Akwa Ibom, Bayelsa, Cross River, Delta, Edo, and Rivers
• South West: Ekiti, Lagos, Ogun, Osun, Ondo, and Oyo
The 2021 NMIS used the sample frame for the proposed 2023 Population and Housing Census (PHC) of the Federal Republic of Nigeria. Administratively, Nigeria is divided into states. Each state is subdivided into local government areas (LGAs), each LGA is divided into wards, and each ward is divided into localities. Localities are further subdivided into convenient areas called census enumeration areas (EAs). The primary sampling unit (PSU), referred to as a cluster unit for the 2021 NMIS, was defined on the basis of EAs for the proposed 2023 PHC.
A two-stage sampling strategy was adopted for the 2021 NMIS. In the first stage, 568 EAs were selected with probability proportional to the EA size. The EA size is the number of households residing in the EA. The sample selection was done in such a way that it was representative of each state. The result was a total of 568 clusters throughout the country, 195 in urban areas and 373 in rural areas.
For further details on sample design, see Appendix A of the final report.