Nigeria - Demographic and Health Survey, 2008, Fifth Round

A complete listing of households and a mapping exercise were carried out for each cluster from April to May 2008, with the resulting lists of households serving as the sampling frame for the selection of households in the second stage. All private households were listed. The NPC listing enumerators were trained to use Global Positioning System (GPS) receivers to take the coordinates of the 2008 NDHS sample clusters.

The 2008 NDHS sample was selected using a stratified two-stage cluster design consisting of 888 clusters, 286 in the urban and 602 in the rural areas. Once the number of households was allocated to each state, the numbers of clusters (calculated based on an average sample take of 41 completed interviews or about 41 selected households) was calculated by dividing the total sample in the state by the sample take.

Finally, all women 15-49 yearswere interviewed in each cluster, and in half of the selected households about 20 men were interviewed. Before the selection in a state, all EAs were stratified by urban and rural areas.
A representative sample of 36,800 households was selected for the 2008 1 The final survey sample included 886 instead of 888 clusters. During fieldwork, access was not obtained in one cluster due to flooding, and in another cluster due to inter-communal disturbances.NDHS survey, with a minimum target of 950 completed interviews per state.

Men age 15-59 were interviewed in every second household selected for the women’s interview. According the 2003 NDHS, a total of 2,346 successfully completed male interviews were obtained with a sample of 2,569 selected households.Therefore, it was expected to have about 16,800 successfully completed male interviews in the 2008 NDHS.

The sample for the 2008 NDHS was designed to provide population and health indicators at the national, zonal, and state levels. The sample design allowed for specific indicators, such as contraceptive use, to be calculated for each of the 6 zones and 37 states (36 states plus the Federal Capital Territory, Abuja). The sampling frame used for the 2008 NDHS was the 2006 Population and Housing Census of the Federal Republic of Nigeria conducted in 2006, provided by the National Population Commission (NPC). Administratively, Nigeria is divided into states. Each state is subdivided into local government areas (LGAs), and each LGA is divided into localities. In addition to these administrative units, during the 2006 Population Census, each locality was subdivided into convenient areas called census enumeration areas (EAs). The primary sampling unit (PSU), referred to as a cluster for the 2008 NDHS, is defined on the basis of EAs from the 2006 EA census frame.

NOTE:
See the formula and more about the sampling procedure in page 491 to page 493 of the report attached in external resources.


No deviation was reported in the survey report use for the documentation.


Total of 36,298 households were selected and of these 34,644 were occupied. Of the 34,644 households found, 34,070 were successfully interviewed, yielding
a response rate of 98 percent at household level.

In the interviewed households, a total of 34,596 women were identified to be eligible for the individual interview, and 97 percent of them were successfully interviewed
.
For men, 16,722 were identified as eligible in half the households, and 93 percent of them were successfully interviewed.

NOTE:
The household and individual response rates for the 2008 NDHS are shown in Table 1.2. A in the report on page 40 attached as external resources.