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Kilifi HDSS INDEPTH Core Dataset 2002-2013 (Release 2017)

Kenya, 2002 - 2013
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Reference ID
KEN_2002-2013_INDEPTH-KHDSS_v01_M
Producer(s)
Tom Williams, Anthony Scott, Evasius Bauni
Metadata
DDI/XML JSON
Created on
Sep 19, 2018
Last modified
Sep 19, 2018
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  • Identification
  • Version
  • Scope
  • Coverage
  • Producers and sponsors
  • Sampling
  • Survey instrument
  • Data collection
  • Data processing
  • Data appraisal
  • Access policy
  • Data Access
  • Disclaimer and copyrights
  • Contacts

    • Identification

    Survey ID number

    KEN_2002-2013_INDEPTH-KHDSS_v01_M
    Title

    Kilifi HDSS INDEPTH Core Dataset 2002-2013 (Release 2017)
    Country
    Name Country code
    Kenya KEN
    Study type

    Demographic and Health Survey [hh/dhs]
    Series Information

    Round 1 to round 40 of the annual demographic surveillance rounds
    Abstract

    The Kilifi Health and Demographic Surveillance System (KHDSS), located on the Indian Ocean coast of Kenya, was established in 2000 as a record of births, pregnancies, migration events, deaths and cause of deaths and is maintained by 4-monthly household visits. The study area was selected to capture the majority of patients admitted to Kilifi District Hospital. The KHDSS has 284 000 residents and covers 891 km2 and the hospital admits 4400 paediatric patients and 3400 adult patients per year. At the hospital, morbidity events are linked in real time by a computer search of the population register. Linked surveillance was extended to KHDSS vaccine clinics in 2008.

    KHDSS data have been used to define the incidence of hospital presentation with childhood infectious diseases (e.g. rotavirus diarrhoea, pneumococcal disease), to test the association between genetic risk factors (e.g. thalassaemia and sickle cell disease) and infectious diseases, to define the community prevalence of chronic diseases (e.g. epilepsy), to evaluate access to health care and to calculate the operational effectiveness of major public health interventions (e.g. conjugate Haemophilus influenzae type b vaccine). Rapport with residents is maintained through an active programme of community engagement. A system of collaborative engagement exists for sharing data on survival, morbidity, socio-economic status and vaccine coverage.
    Unit of Analysis

    Individual

    Version

    Version Description

    CMD2013.v1: For piblic distribution
    Version Date

    2017-05-15

    Scope

    Notes

    The scope of the survey includes:

    1. Unique individuals identifier, sex, vital status and date of birth

    2. Events - birth, migrations, enumeration, death, pregnancy and date of event/observation
    Topics
    Topic Vocabulary URI
    Demography [N01.224] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Emigration and Immigration [N01.224.625.350] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Mortality [N01.224.935.698] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Birth Rate [N01.224.935.849.500] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Keywords
    Mortality Fertility Migration Population

    Coverage

    Geographic Coverage

    Kilifi District is situated 60km to the north of Mombasa on the Kenyan coast. It has an area of approximately 2,500 square kilometres and a population of 650,000. A flat coastal strip extends approximately 10km inland to low hills rising to an altitude of 250 metres

    An area of 891 km2 was selected as the smallest number of administrative sublocations that collectively included the stated sublocation of residence of at least 80% of paediatric inpatients in the preceding 3 years (1998-2000). KDH is located in Kilifi town, 3° south of the equator and KHDSS extends up and down the coastal strip for 35 km from Kilifi. KDH is the only inpatient facility offering paediatric services in the KHDSS area. The local economy is based on subsistence farming of maize, cassava, cashew nuts and coconuts as well as goats and dairy cows. Two large agricultural estates, two research institutes and several tourist hotels contribute to local employment.
    Universe

    All individuals in the HDSS area

    Producers and sponsors

    Primary investigators
    Name Affiliation
    Tom Williams KEMRI Wellcome Trust Research Programme (KWTRP)
    Anthony Scott KEMRI Wellcome Trust Research Programme (KWTRP)
    Evasius Bauni KEMRI Wellcome Trust Research Programme (KWTRP)
    Producers
    Name Affiliation Role
    David Amadi KWTRP Data Manager
    Emmanuel Tsory KWTRP Field Supervisor
    David Walumbe KWTRP Field Manager
    Chrisopher Nyundo KWTRP Catographer
    Boniface Jibendi KWTRP Sytem Developer
    Mark Otiende KWTRP Statistician
    Funding Agency/Sponsor
    Name
    Wellcome Trust
    Other Identifications/Acknowledgments
    Name
    Population of Kilifi HDSS

    Sampling

    Sampling Procedure

    No sampling, complete population surveyed
    Deviations from the Sample Design

    Not Applicable
    Response Rate

    On an average, the response rate is 99.9% over the years in every round.
    Weighting

    Not Applicable

    Survey instrument

    Questionnaires
    1. Enumeration of persons

    The Enumeration of People Data Entry Form has all names of residents within an homestead (Hm). This form bears the Enumeration Zone ( EZ) and Hm numbers, Hm name and name of homesteadhead. Also, it has details of each individual such as name, sex, ethinicity, pregnancy status, Kenya national identification number, Mother's national identification card number as well as the BU where an individual sleeps. A Fw uses this form to up-date the residence status of people.

    1. Enumeration of buildings

    This form has a list of all homesteads and existing buildings in each homestead (Hm). The form indicates: Hm name, Hm number and building units(BUs) in alphabet numbers. The geographical co-ordinates and materials used to make each building are also included. The census FWs update this form to show if the building unit still exists or if the BU has been demolished.

    1. Listing of all registered Homesteads
      The Listing of All Registered Homesteads form has all active Hms in a sub-enumeration zone (sub- EZ) according to the previous census round. It is used to confirm number and specific HMs in a sub-EZ with the records of Building Structure (BS) Data Entry Form

    2. In migrants

    This form is used to record new people who have moved into an existing or a new homestead, or people who have been present but missed in the previous census rounds and intend to stay for the next three or more months.

    5 .Births

    This form is used to record all new born babies by resident mothers. In this form, all personal details of the baby are recorded and linked to those of the mother if she is a resident.

    1. Pregnancy
      All resident women within the reproductive age bracket i.e., between 15 and 49 years, are usually flagged in the Enumeration Data Entry form to be asked about their pregnancy status.

    2. Change person details
      Change Personal Details Data Entry form is designed to record changes of personal details.The Change Personal Details Data Entry form provides fields and codes used to effect such changes or corrections. Accuracy of the new value must be supported by evidence, preferrably documented evidence for example, a national identification card for date of birth.

    8 .Change buildings details
    The change buildings details data entry form is designed to record changes relating to building materials, category and coordinates of a building unit as well as change of homestead names. Potential areas for changes and corrections include the Hm name, roof, wall, storey, longitudes, latitudes and elevation. Specific codes are used to describe the type of a building characteristic to be changed.

    1. Maps
      KHDSS enumerators use EZ maps with a list of Hms that bears coresponding Hm numbers. Vital landmarks, roads and other features are displayed on a map to assist locate and identify Hms. These maps are up-dated every census round by the mapping team and enumerators. Global Positioning System (GPS) and Geographic Information System (GIS) technologies are used to develop and maintain a mapping database. ETrex garmin GPS receivers are used to collect spatial data and ArcGIS 10 is used to manipulate, edit, store and generate maps.

    10.Verbal autopsy

    11.Extra Questions

    Data collection

    Dates of Data Collection
    Start End Cycle
    2002-01-01 2013-12-31 2017 Release Coverage
    Frequency of Data Collection

    Three rounds in a year
    Data Collectors
    Name Affiliation
    Kilifi Health and Demographic Surveillance System KEMRI-cGMRC
    Supervision

    1. Spot checks
      Spot checks refer to random verification of certain details or information about the study. For example, a field supervisor can flip through a fieldworker’s records after the fieldworker has visited a homestead to ascertain that all records are complete. Another area for a spot check is a field supervisor visiting a home previously visited by a fieldworker to confirm that the interview was conducted as indicated. The supervisor can verify few details for example, date of birth of certain individuals at the homestead and details of a migration event. These are then compared with the records earlier presented by a fieldworker.

    2. Repeat interviews
      This can be done at the end of the round by picking a 5% sample then re-interviewing. After the re-interviews, the collected data are compared with that captured by the fieldworkers to check if they were accurate. Another approach is to conduct a repeat interview a day after the initial interview but still take note of the respondent

    3. Field Data verification

    4. Field follow ups for refusals
    Data Collection Notes

    All KHDSS staffs have undergone intensive training in communication skills, conducting interviews, mapping and map reading. At the end of every census round, the group spends a week on debriefing and retraining. This is usually conducted to appraise the team on what has been done i.e., achievements and challenges. The aim is to identify gaps for improvement in the subsequent rounds. The debriefing provides an opportunity for improvement and retraining in some aspects that may require emphasis and clarifications. Also it is in this forum where training for any new work/extra questions and activity accompanying the traditional census work is done. During the debriefings, changes and recommendations are adopted and documented.

    Data processing

    Data Editing

    Manual editing
    A manual editor on daily basis checks completed tools for completeness and consistency. Those that have issues are returned to the responsible fieldworkers for correction and/or follow ups. Manual editor’s reports are instrumental in evaluating fieldworkers after every two weeks.

    Complementary nature of KEMRI studies
    Kemri-Wellcome Trust Programme has a number of research studies being conducted in the same KHDSS census area. Some of these studies are nested within the KHDSS and have proved useful in improving data quality. For example, issues have been raised concerning some details such as date of birth and sex, which prompted verifications in the field and corrections.

    The following processing checks are done during the ETL process.

    1. If the first event is legal. Like the first event must beenumeration, birth or inmigration.

    2. If the last event is legal. Like the last event must be end of observtion, death or outmigration.

    3. If the transition events are legal.
      The list of legal transitions:

      Birth followed by death
      Birth followed by exit
      Birth followed by end of observation
      Birth followed by outmigration

      Death followed by none

      Entry followed by death
      Entry followed by exit
      Entry followed by end of observation
      Entry followed by outmigration
      Enumeration followed by death
      Enumeration followed by exit
      Enumeration followed by outmigration

      Exit followed by entry

      Inmigration followed by Death
      Inmigration followed by exit
      Inmigration followed by end of observation
      Inmigration followed by outmigration

      End of observation followed by none

      Outmigration followed by none
      Outmigration followed by enumeration
      Outmigration followed by inmigration

      The list of illegal transitions:

      Birth followed by none
      Birth followed by birth
      Birth followed by entry
      Birth followed by enumeration
      Birth followed by inmigration

      Death followed by birth
      Death followed by death
      Death followed by entry
      Death followed by enumeration
      Death followed by exit
      Death followed by inmigration
      Death followed by outmigration
      Death followed by end of observation

      Entry followed by none
      Entry followed by birth
      Entry followed by entry
      Entry followed by enumeration
      Entry followed by inmigration

      Enumeration followed by none
      Enumeration followed by birth
      Enumeration followed by entry
      Enumeration followed by enumeration
      Enumeration followed by inmigration

      Exit followed by birth
      Exit followed by death
      Exit followed by exit
      Exit followed by end of observation
      Exit followed by outmigration

      Inmigration followed by none
      Inmigration followed by birth
      Inmigration followed by entry
      Inmigration followed by enumeration
      Inmigration followed by inmigration

      End of observation followed by birth
      End of observation followed by death
      End of observation followed by entry
      End of observation followed by enumeration
      End of observation followed by exit
      End of observation followed by inmigration
      End of observation followed by end of observation
      End of observation followed by outmigration

      Outmigration followed by birth
      Outmigration followed by death
      Outmigration followed by exit
      Outmigration followed by end of observation
      Outmigration followed by outmigration

      List of edited events:

      Exit followed by none
      Exit followed by enumeration
      Exit followed by inmigration
      Outmigration followed by entry

    Data appraisal

    Estimates of Sampling Error

    Not Applicable
    Data Appraisal

    CentreId MetricTable QMetric Illegal Legal Total Metric RunDate
    KE011 MicroDataCleaned Starts 674958 2017-05-15 12:35
    KE011 MicroDataCleaned Transitions 0 1931606 1931606 0 2017-05-15 12:37
    KE011 MicroDataCleaned Ends 674958 2017-05-15 12:38
    KE011 MicroDataCleaned SexValues 418 1931188 1931606 0 2017-05-15 12:39
    KE011 MicroDataCleaned DoBValues 416 1931190 1931606 0 2017-05-15 12:39

    Access policy

    Archive where study is originally stored

    Kilifi (KE011)

    Data Access

    Access authority
    Name Affiliation URL Email
    iSHARE2 Help Desk INDEPTH Network http://indepth-ishare.org help-data@indepth-network.org
    Confidentiality
    Is signing of a confidentiality declaration required? Confidentiality declaration text
    yes This data is anonymised and no confidentiality agreement in addition to the general data use agreement is required.
    Access conditions

    This data is made available for licensed access under the following conditions:

    1. Data and other material provided by INDEPTH will not be redistributed or sold to other individuals, institutions or organizations without INDEPTH's written agreement.

    2. In the case of multi-centre datasets, data originating from a single contributing member centre of the INDEPTH Network may not be analysed or reported on in isolation without the express permission of the member centre concerned.

    3. No attempt will be made to re-identify respondents, and there will be no use of the identity of any person or establishment discovered inadvertently. Any such discovery will be reported immediately to INDEPTH.

    4. No attempt will be made to produce links between datasets provided by INDEPTH or between INDEPTH data and other datasets that could identify individuals.

    5. Any books, articles, conference papers, theses, dissertations, reports or other publications employing data obtained from INDEPTH will cite the source, in line with the citation requirement provided with the dataset.

    6. An electronic copy of all publications based on the requested data will be sent to INDEPTH.

    7. The original collector of the data, INDEPTH, and the relevant funding agencies bear no responsibility for the data's use or interpretation or inferences based upon it.
    Citation requirements

    Any use of this dataset must cite the digital object identifier (doi) associated with this dataset. Using the following form:

    "Kilifi HDSS INDEPTH Core Dataset 2002-2013 (Release 2016). Provided by the INDEPTH Network Data Repository. www.indepth-network.orghttp://www.indepth-network.org. doi:10.7796/INDEPTH.KE011.CMD2013.v1"

    Disclaimer and copyrights

    Disclaimer

    The user of the data acknowledges that the original collector of the data, INDEPTH, and the relevant funding agencies bear no responsibility for the data's use or interpretation or inferences based upon it.
    Copyright

    This dataset documentation is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. The dataset is shared in terms of the data-use agreement accepted at the time of data download.

    Contacts

    Contacts
    Name Affiliation Email URL
    iSHARE2 Helpdesk INDEPTH Network help-data@indepth-network.org http://www.indepth-ishare.org/index.php/howtouse
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