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Tanzania Disability Survey 2008, First Round

Tanzania, 2008
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Reference ID
TZA-NBS-DSR-2008-v01
Producer(s)
National Bureau of Statistics, Office of the Chief Government statistician, Zanzibar
Metadata
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Created on
Feb 13, 2022
Last modified
Aug 20, 2024
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  • Identification
  • Version
  • Scope
  • Coverage
  • Producers and sponsors
  • Sampling
  • Survey instrument
  • Data collection
  • Data processing
  • Access policy
  • Disclaimer and copyrights
  • Contacts
  • Metadata production

    • Identification

    Survey ID number
    TZA-NBS-DSR-2008-v01
    Title
    Tanzania Disability Survey 2008
    Subtitle
    First Round
    Country
    Name Country code
    Tanzania TZA
    Study type
    Demographic and Health Survey, Special [hh/dhs-sp]
    Series Information
    The 2008 Tanzania Disability Survey was the first of its kind to be conducted in the country. The major objective of the survey was to determine the prevalence of disability in the country. The survey also intended to determine living conditions among people with activity limitations. The survey covered the whole of the United Republic of Tanzania and produced regional estimates. Information was collected from all selected households and individuals with and without disability and health difficulties.
    Abstract
    This report presents findings of the 2008 Tanzania Disability Survey. The survey was conducted by the National Bureau of Statistics (NBS), in collaboration with the Office of the Chief Government Statistician, Zanzibar (OCGS) and the Ministry of Health and Social Welfare. This was the first time for Tanzania to carry out such a comprehensive survey on people with disabilities. The survey was household based and covered both Tanzania Mainland and Zanzibar.

    The major objective of the 2008 Tanzania Disability Survey was to determine the prevalence of disability in the country. The survey also intended to determine living conditions among people with activity limitations. It is anticipated that results generated from 2008 Tanzania Disability will contribute to the improvement of the living conditions among people with activity limitations in Tanzania; initiate a discussion on the concepts and understanding of “disability” and monitor the impact of government policies, programmes and donor support on the well being of the population with activity limitations.
    Kind of Data
    Sample survey data [ssd]
    Unit of Analysis
    Individuals, Households, Children

    Version

    Version Description
    Version 01(Public use file for web dissemination)
    Version Date
    2009-12

    Scope

    Notes

    Household: Identification, Interviewer visits, Household Roster, Household Particulars
    Individual: Identification of personal with difficulties, Functioning, Causes and History of Difficulties, Awareness and/or needs of services, Education, Employment and Income, Assistive Devices.
    Children: Identification of child with Difficulties, Difficulties and Environmental factors, Child's difficulties, Education, Assistive Devices.

    Topics
    Topic Vocabulary URI
    HEALTH [8] CESSDA
    Keywords
    HEALTH [8]

    Coverage

    Geographic Coverage
    Tanzania Mainland and Zanzibar
    Geographic Unit
    Clusters
    Universe
    Persons aged 15 years and above and Children aged 0-14 years.

    Producers and sponsors

    Primary investigators
    Name Affiliation
    National Bureau of Statistics Ministry of Finance and Economic Affairs
    Office of the Chief Government statistician, Zanzibar Government of Zanzibar
    Producers
    Name Affiliation Role
    Ministry of Health and Social Welfare Government of Tanzania Technical Assistance
    Human Science and Research Institute of South Africa South Africa Technical Assistance on development of questionnares
    UNICEF United Nation Technical Assistance
    UNFPA United Nation Technical Assistance
    UN systems Country Offices United Nation Technical Assistance
    Census and Survey Technical Working Group Poverty Reduction Strategy Framework, Tanzania Accepting the Survey to be Conducted.
    Funding Agency/Sponsor
    Name Role
    Government of Tanzania Financial Support
    Developments Partners Financial Support
    Other Identifications/Acknowledgments
    Name Affiliation Role
    Margie Schneider Human Sciences Research Council of South Africa Technical Assistance
    Irenius Ruyobya National Bureau Of Statistics, Tanzania Technical Assistance
    Mayasa Mwinyi Office of the Chief Government Statistician, Zanzibar Technical Assistance
    N'yampule Madai and his team Ministry of Health and Social Welfare, Tanzania Technical Assistance
    Dr. Frida Tungaraza University of Dar es Salaam, Tanzania Technical Assistance
    Prof. Innocent Ngalinda Institute of Finance Management, Tanzania Technical Assistance
    Ahmed Makbel National Bureau Of Statistics, Tanzania Technical Assistance
    Aldegunda Komba National Bureau Of Statistics, Tanzania Technical Assistance
    Sango Simba National Bureau Of Statistics, Tanzania Technical Assistance
    James Mbongo National Bureau Of Statistics, Tanzania Technical Assistance
    Tito Mwisomba National Bureau Of Statistics, Tanzania Technical Assistance
    Emilian Karugendo National Bureau Of Statistics, Tanzania Technical Assistance
    Seif Kuchengo National Bureau Of Statistics, Tanzania Technical Assistance
    Neema Ngure National Bureau Of Statistics, Tanzania Technical Assistance
    Mayasa Mahfoudh Office of the Chief Government Statistician, Zanzibar Technical Assistance
    Amour Bakari Office of the Chief Government Statistician, Zanzibar Technical Assistance
    Mbwana Othman Office of the Chief Government Statistician, Zanzibar Technical Assistance
    Haroub Ali Masoud Office of the Chief Government Statistician, Zanzibar Technical Assistance
    Joy Maongezi Ministry of Health and Social Welfare, Tanzania Technical Assistance
    Doroth Semu Ministry of Health and Social Welfare, Tanzania Technical Assistance
    Kaganzi Lutachwamagi Organizations of People with Disabilities, Tanzania Technical Assistance

    Sampling

    Sampling Procedure
    The survey was national representative and information was collected from all selected households and individuals with and without disability (measured as activity limitations).

    The primary sampling unit for the survey was the census enumeration area (EA) and the ultimate sampling unit was the individual household members. The survey utilized a three-stage systematic stratified random sampling design involving clusters (EAs), households and individual household members.

    The desired confidence level for the survey was 95 percent (za/2 with 1.96), with an error margin (E) of 2 percent in estimating the parameters. The expected prevalence (P) of mild and severe cases of disability was estimated to vary between 10 and 20 percent (P=0.15) of the country's population. Details on sampling procedures are attached as Annex II.
    Response Rate
    The total responding households were 6,882 out of the anticipated 7,025 with a population of more than 35,000 compared to the expected 32,000. The overall response rate for households was 98 percent.
    Weighting
    There were two sets of sampling weights for the survey. The first set was the cluster or EA weights based on their selection from the 2002 Population and Housing Census EAs frame. The second set comprised household weights based on listing of households in all the selected EAs. Information in this report is based on weighted data.

    Survey instrument

    Questionnaires
    Development of survey questionnaires started in 2006 with technical assistance from Human Science and Research Institute of South Africa. Three types of questionnaires were used. These were the household questionnaire that was administered to all selected households, and individual questionnaires that were administered to children aged 0 -14 years and adults aged 15 years and above. (Annex I).

    Two pre-tests were conducted before the survey. Questionnaires were pre-tested on 25 households in Kibaha District in October 2006. The main objective of the pre - test was to test the way in which respondents understood and interpreted the main questions on difficulties used to identify the population with activity limitations.

    Observations from this pre-test were used to improve the questionnaires before conducting a relatively bigger pilot survey in Dodoma Municipality in July 2007. A total of 18 interviewers and 4 supervisors were involved. Training was done in 5 days and data collection lasted for 10 days. A total of 154 households were successfully interviewed.

    The household questionnaire was used to list all the usual members and visitors in each selected household. Basic information was collected on the characteristics of each person listed, including his/her relationship with the head of the household, age, sex, marital status, education and economic status. For children less than 18 years of age, survival status of the parents was also recorded. The household questionnaire also included questions on activity limitations of the respondent. These screening questions were used to determine persons with disabilities. All those who reported at least one activity limitation were further interviewed individually. Household questionnaires also collected information on household characteristics including main source of drinking water, toilet facilities, source of energy, building materials and possession of certain assets. Information on food security, use of mosquito nets and deaths of children less than five years of age was also collected.

    The adult questionnaire was used to collect information from all person aged 15 years and above who were identified in the household questionnaire as having some form of disability. The questionnaire collected information on the following topics:
    · Activity limitations and participation restrictions;
    · Environmental factors;
    · Awareness, need and receipt of services;
    · Education and employment;
    · Assistive devices and technology;
    · Accessibility in the home and surroundings;
    · Inclusion in family and social life; and
    · Health and general well-being.
    The children questionnaire collected information from all children identified as having disabilities and collected more or less the same information as in the adult questionnaire.

    Data collection

    Dates of Data Collection
    Start End
    2008-07 2008-11
    Data Collection Mode
    • Face-to-face [f2f]
    Data Collectors
    Name Affiliation
    National Bureau of Statistics Ministry of Finance and Economic Affairs.
    Supervision
    A total of 100 field staffs were recruited by the NBS and OCGS to serve as enumerators. Supervisors were permanent staff from the same offices. Organisations of People with Disability were also represented by four participants who had a responsibility of clarifying terms used in the questionnaires. Besides participating in training representatives from these Organisations was also part of supervisory teams.

    The main training was held in June 2008 for three weeks in Morogoro Region. Trainers were from the National Bureau of Statistics, Office of the Chief Government Statistician, Higher Learning Institutes and the Ministry of Health and Social Welfare. The training involved both theory and practical exercises.

    Fieldwork
    As a part of fieldwork several activities were implemented. These include listing, sampling, data collection and supervision of field teams.

    Listing
    Before the listing exercise, supervisors and enumerators were trained on map reading and listing. The listing of households in each selected EA was done a few days before the data collection exercise to ensure accurate and up to date information. Supervisors ensured that all households in the EA were listed according to the given instructions and EA map. Supervisors had also the responsibility of selecting households to be interviewed.
    Data Collection Notes
    Data collection begun in the first week of July 2008 up to mid November 2008. There were twelve data collection teams, ten on the Mainland and two in Zanzibar. Each team consisted of a supervisor, six or seven enumerators and a driver. Supervisors were responsible for the overall administrative work in the field including checking the quality of the questionnaires before sending them to NBS headquarters in Dar es Salaam for processing. Officers from NBS, OCGS and Ministry of Health and Social Welfare visited the teams periodically to review their work and monitor the data collection exercise.

    The main respondents for the household questionnaire were the household heads or any other responsible adults in the household. For the detailed questionnaires, adults answered as direct respondents but proxy respondents were used for children under 15 years of age and adults who were unable to respond.

    Data processing

    Data Editing
    Data processing was done centrally at NBS headquarters in Dar es Salaam. Data processing started concurrently with the fieldwork. The data processing personnel included supervisors and a questionnaire administrator, who ensured that the expected numbers of questionnaires from all clusters were received. There were also five office editors and ten data entrants. The CsPro computer package was used for data processing. The data entry and editing phase of the survey was completed in December 2008

    Access policy

    Confidentiality
    Is signing of a confidentiality declaration required? Confidentiality declaration text
    yes Confidentiality of respondents is guaranteed by section 20 of Tanzania Statistics act number 1 of 2002.
    Before being granted access to the dataset, all users have formally agree:
    1.all identifying information such as the name and address of respondent has been removed; and
    2.the information is disclosed in a manner that is not likely to enable the identification of the
    particular person or undertaking or business to which it relates.
    3.not attempt to identify any particular person or undertaking or business;
    4.use of information for research or statistically purpose only;
    5.not to disclose the information to any other person, organization
    6.when required by the Director General, return all documents made available to him to the Director General;
    7.comply with the directions given by the Director General relating to the records.
    8.every person involved in the research or statistical project for which information is disclosed pursuant to this section shall make the declaration of secrecy set out in the first schedule.
    Access conditions
    Tanzania NBS considered three levels of accessibility:

    1) Public use files, accessible by all
    2) Licensed datasets, accessible under certain conditions
    3) Datasets only accessible on location, for certain datasets

    The dataset has been anonymized and available as a public use dataset. It accessible to all for statistical and research purposes only, under the following terms and conditions:
    1.The data and other material will not be redistributed or sold to other individuals, institutions, or organization without the written agreement of the National Bureau of Statistics.
    2.The data will be used for statistical and scientific research purposes only. They will be used solely for reporting of aggregated information, and not for investigation of specific individuals or organizations.
    3.No attempt will be made to produce links among dataset provided by the National Bureau of Statistics, or among data from the (National Bureau of Statistics) and other datasets that could identify individuals or organizations
    4.No attempt will be made to re-identify respondents, and no use will be made of the identify of any person or establishment discovered inadvertently. Any such discovery would immediately be reported to the National Bureau of Statistics.
    5.Any books, articles, conference papers, theses, dissertations, reports, or other publications that employ data obtained from the National Bureau of Statistics will cite the source of data in accordance with the Citation Requirement provided with each dataset.
    Citation requirements
    "National Bureau of Statistics, DisabilitySurvey Report 2008 (DSR 2008), version 1.0 of the public use dataset(December 2009) provided by the National Bureau of Statistics, www.nbs.go.tz"
    Access authority
    Name Affiliation URL Email
    National Bureau of Statistics National Bureau of Statistics National Bureau of Statistics Ministry of Finance and Economic Affairs dg@nbs.go.tz

    Disclaimer and copyrights

    Disclaimer
    "The user of the data should acknowledges that, National Bureau of Statistics is the original collector of the data , the authorised distributor of the data, and the relevant funding agency bear no responsibility for use of the data or for interpretations or inferences without a written agreement from the National Bureau of Statistics"
    Copyright
    (c) 2008, National Bureau of Statistics

    Contacts

    Contacts
    Name Affiliation Email URL
    Director General National Bureau of Statistics dg@nbs.go.tz

    Metadata production

    DDI Document ID
    TZA-NBS-DSR-2008-v01
    Producers
    Name Affiliation Role
    National Bureau of Statistics Ministry of Finance and Economic Affairs Data Producer
    Office of the Chief Government Statistician, Zanzibar Government of Zanzibar Data Producer
    Accelerated Data Program PARIS21 Review of the metadata
    Date of Metadata Production
    2011-02-03

    Metadata version

    DDI Document version
    Version 01 (Public use file for web dissemination)
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