Nigeria - National Survey on Drug Use and Health 2016-2017, First round

Computer Assisted Personal Interviewing (CAPI) method was used for the data collection for the household component, while paper questionnaires were used for both Drug users' and Key Informant components.

Data Processing for the household survey was done at the ICT Department, NBS Headquarters. Activities carried out include:
1) Electronic editing
2) Data Validation
3) Data cleaning
4) Data Analysis
5) Data Anonymization
6) Table Generation

All data from the drug user and key informant surveys in the files submitted by the zonal coordinators were subjected to verification and validation by a data company in Uyo (Corporate Business Research Services, CBRS) that served as a data management consultant for the project.

Further processing of the data was carried out by a private firm (Corporate Business Research Services). CBRS submitted a 16-page report to CRISA detailing every action taken in cleaning and merging the data sets before handing over to CRISA. Much of this work was done in collaboration with CRISA staff members assigned to oversee this aspect of the project. Most of the issues addressed by CBRS were because of inconsistencies in data entry at the various centres. In a few cases where such inconsistences were serious enough data from affected states had to be re-entered at CRISA. (These states are specified in the CBRS report). We believe that though the decision to decentralize data entry was taken after careful consideration of data safety, that decision contributed to the delay in completing the overall work on this project.