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Niakhar HDSS INDEPTH Core Dataset 1984 - 2014 (Release 2017)

Senegal, 1984 - 2014
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Reference ID
SEN_1984-2014_INDEPTH-NHDSS_v01_M
Producer(s)
Cheikh Sokhna, Laurence Fleury, Valérie Delaunay, El-Hadji Konko Ciré Bâ
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

    SEN_1984-2014_INDEPTH-NHDSS_v01_M
    Title

    Niakhar HDSS INDEPTH Core Dataset 1984 - 2014 (Release 2017)
    Country
    Name Country code
    Senegal SEN
    Study type

    Demographic Surveillance
    Series Information

    This dataset contains rounds 1 to 16 of demographic surveillance data covering the period from 1 Jan 2008 to 31 December 2016.

    An initial baseline census was carried out in 1962 for 8 villages, followed by another one in 1983 when the study area of Niakhar was expanded. From 1962 to 1987, data were collected through annual rounds during the dry season. Demographic events were collected by interviewers using a printed list of compound residents with their characteristics. From 1987 to 1997, rounds became weekly because of the need for continuous birth registration for vaccine trials. Annual censuses were carried out to check data collection, particularly relative to in- and out-migration. Routine visits were conducted in the 30 villages of the study area every three months between 1997and 2007 and every four months between 2008 and 2012 and every six month since then. Interviews are conducted with tablet PC since 2007. Verbal autopsies are completed after each round by trained personnel.
    Abstract

    The Health and Demographic Surveillance System (HDSS) in Niakhar, a rural area of Senegal, is located 135 km east of Dakar. This HDSS has been set up in 1962 by the Institut de Recherche pour le Développement (IRD) to face the shortcomings of the civil registration system and provide demographic indicators.

    Some 65 villages were followed annually in the Niakhar area from 1962 to 1969. The study zone was reduced to eight villages from 1969 to 1983, and from then on the HDSS was extended to include 22 other villages, covering a total of 30 villages for a population estimated at 45,000 in December 2013. Thus 8 villages have been under demographic surveillance for almost 50 years and 30 villages for 30years.

    Vital events, migrations, marital changes, pregnancies, immunization are routinely recorded (every four months). The database also includes epidemiological, economic and environmental information coming from specific surveys. Data were collected through annual rounds from 1962 to 1987; rounds became weekly from 1987 to 1997; routine visits were conducted every three months between 1997and 2007 and every four months since then.

    The current objectives are 1) to obtain a long-term assessment of demographic and socio-economic indicators necessary for bio-medical and social sciences research, 2) to keep up epidemiological and environmental monitoring, 3) to provide a research platform for clinical and interdisciplinary research (medical, social and environmental sciences). Research projects during the last 5 years are listed in Table 2. The Niakhar HDSS has institutional affiliation with the Institut de Recherche pour le Développement (IRD, formerly ORSTOM).
    Kind of Data

    Event history data
    Unit of Analysis

    Individual

    Version

    Version Description

    CMD2014.v1
    Version Date

    2017-05-20

    Scope

    Notes

    This study represents only a portion of the total data associated with the complet Niakhar demographic surveillance as described in the study abstract.

    It specifically only includes the events defining the resident exposure of individuals under surveillance as well as the delivery events of resident women. Each type of event contains minimal attributes describing the event:

    Attributes common to each event: Event Type, Event Date, Observation Date

    Migration: Origin & Destination

    Delivery: Live born and Still born counts
    Topics
    Topic Vocabulary URI
    Demography [N01.224] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Age Distribution [N01.224.033] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Emigration and Immigration [N01.224.625.350] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Residential Mobility [N01.224.791.700] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Sex Distribution [N01.224.803] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Vital Statistics [N01.224.935] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Life Expectancy [N01.224.935.464] 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
    Rural Population [N01.600.725] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Maternal Age [N06.850.490.250.550] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Parity [N06.850.490.812.600] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Survival Analysis [N06.850.520.830.998] MeSH http://www.ncbi.nlm.nih.gov/mesh
    Keywords
    Migration Mortality Fertility Population

    Coverage

    Geographic Coverage

    The study zone of Niakhar is located in Senegal, 14.5ºN Latitude and 16.5ºW Longitude in the department of Fatick (Sine-Saloum), 135 km east of Dakar. The Niakhar study zone covers 203 square kilometres and is located in the continental Sahelian-Sudanese climatic zone. For thirty years the region has suffered from drought. The average annual rainfall has decreased from 800 mm in the 1950s to 500 mm in the 1980s. Increasing amounts of precipitation have been observed since the mid-2000s with an average annual rainfall of 600 mm between 2005 and 2010. The area is 203 square kilometers.
    Universe

    Members of households reside within the demographic surveillance area. Inmigrants are defined by intention to become resident, but actual residence episodes of less than 180 days are censored. Outmigrants are defined by intention to become resident elsewhere, but actual periods of non-residence less than 180 days are censored, except seasonal work migrants, worker with a wife resident, pupils or students. Children born to resident women are considered resident by default, irrespective of actual place of birth. The dataset contains the events of all individuals ever resident during the study period (1 Jan 1990 to 31 Dec 2013).

    The Niakhar HDSS collects for each resident the following basic data: individual, household and compound identifying information, mother and father identification, relationship to the head of household and spousal relationship. From 1983 to 2007, the HDSS routinely monitored deaths, pregnancies, births, miscarriages, stillbirths, weaning, migrations, changes of marital status, immunizations, and cases of measles and whooping cough. For the last 5 years, the HDSS only recorded demographic events related to each resident including cause of death. Verbal autopsies have been conducted after all deaths except for those that occurred between 1999 and 2004 where only deaths for people aged 0-55 years were investigated. The Niakhar HDSS also registers visitors as well as all the demographic events related to them in case of in-migration. Household characteristics (living conditions, domestic equipment, etc.) were collected in 1998 and 2003, and community equipment (schools, boreholes, etc.) in 2003. Economic and environmental data will be collected in 2013. Table 3 presents further details on the data items collected. The Niakhar HDSS interviewers collect data with tablet PCs that are loaded with the last updated database linked to a user-friendly interface indicating the household members and the questionnaire. Daily backups are performed on an external hard drive and weekly synchronizations are scheduled during the round, helping to update the database and check data consistency (i.e. residential moves within the study area or marriages). Applications are Developed in Visual Basic.Net and the database is managed with Microsoft Access.

    Producers and sponsors

    Primary investigators
    Name Affiliation
    Cheikh Sokhna Institut de Recherche pour le Développement (IRD)
    Laurence Fleury Institut de Recherche pour le Développement (IRD)
    Valérie Delaunay Institut de Recherche pour le Développement (IRD)
    El-Hadji Konko Ciré Bâ Institut de Recherche pour le Développement (IRD)
    Producers
    Name Affiliation Role
    Mouhamadou Baba Sow Institut de Recherche pour le Développemt (IRD) Data Manager
    Emilie Volpi Institut de Recherche pour le Développemt (IRD) Data Manager
    Adiouma Faye Institut de Recherche pour le Développemt (IRD) Data collector
    Funding Agency/Sponsor
    Name Role
    Institut de Recherche pour le Développemt Current funder
    Other Identifications/Acknowledgments
    Name Affiliation Role
    Paul Senghor Institut de Recherche pour le Développemt (IRD) Verbal Autopsy Interviewer
    Emilie Ndiaye Institut de Recherche pour le Développemt (IRD) Referencies Manager
    Prosper Ndiaye Institut de Recherche pour le Développemt (IRD) Administrative Manager
    Malick Toure Institut de Recherche pour le Développemt (IRD) Logistics Manager

    Sampling

    Sampling Procedure

    This dataset is not based on a sample; it contains information from the complete demographic surveillence area.
    Deviations from the Sample Design

    None
    Response Rate

    On an average the response rate is about 99% over the years for each round
    Weighting

    Not applicable

    Survey instrument

    Questionnaires

    List of questionnaires:

    Compound Registration or update Form
    Houshold Registration or update Form
    Household Membership Registration or update Form
    External Migration Registration Form
    Internal Migration Registration Form
    Individual Registration Form
    Birth Registration Form
    Death Registration Form

    Data collection

    Dates of Data Collection
    Start End Cycle
    1984-01-01 2014-12-31 Release coverage
    Frequency of Data Collection

    This dataset contains rounds 1 to 18 of demographic surveillance data covering the period from 1 Jan 1983 to 31 December 2015.

    From 1983 to 1987, data were collected through annual rounds during the dry season. Demographic events were collected by interviewers using a printed list of compound residents with their characteristics. From 1987 to 1997, rounds became weekly because of the need for continuous birth registration for vaccine trials. Annual censuses were carried out to check data collection, particularly relative to in- and out-migration. Routine visits were conducted in the 30 villages of the study area every three months between 1997and 2007 and every four months between 2008 and 2012 and every six month since then.
    Data Collectors
    Name Affiliation
    NIAKHAR for Health and Population Studies Institut de Recherche pour le Developpement (IRD)
    Supervision

    Fiedworkers operated in teams of 4 Fiedworkers and 1 Fiedworkers supervisor who supervises fieldWorkers. they conduct supervised visits and quality control visits and review Fiedworkers data collection.
    Data Collection Notes

    Interviewer were trained immediately prior to the baseline data collection and then refresher training was conducted for one day between each surveillance round.

    Data processing

    Data Editing

    On data entry data consistency and plausibility were checked by 455 data validation rules at database level. If data validaton failure was due to a data collection error, the questionnaire was referred back to the field for revisit and correction. If the error was due to data inconsistencies that could not be directly traced to a data collection error, the record was referred to the data quality team under the supervision of the senior database scientist. This could request further field level investigation by a team of trackers or could correct the inconsistency directly at database level.

    No imputations were done on the resulting micro data set, except for:

    a. If an out-migration (OMG) event is followed by a homestead entry event (ENT) and the gap between OMG event and ENT event is greater than 180 days, the ENT event was changed to an in-migration event (IMG).
    b. If an out-migration (OMG) event is followed by a homestead entry event (ENT) and the gap between OMG event and ENT event is less than 180 days, the OMG event was changed to an homestead exit event (EXT) and the ENT event date changed to the day following the original OMG event.
    c. If a homestead exit event (EXT) is followed by an in-migration event (IMG) and the gap between the EXT event and the IMG event is greater than 180 days, the EXT event was changed to an out-migration event (OMG).
    d. If a homestead exit event (EXT) is followed by an in-migration event (IMG) and the gap between the EXT event and the IMG event is less than 180 days, the IMG event was changed to an homestead entry event (ENT) with a date equal to the day following the EXT event.
    e. If the last recorded event for an individual is homestead exit (EXT) and this event is more than 180 days prior to the end of the surveillance period, then the EXT event is changed to an out-migration event (OMG)

    In the case of the village that was added (enumerated) in 2006, some individuals may have outmigrated from the original surveillance area and setlled in the the new village prior to the first enumeration. Where the records of such individuals have been linked, and indivdiual can legitmately have and outmigration event (OMG) forllowed by and enumeration event (ENU). In a few cases a homestead exit event (EXT) was followed by an enumeration event in these cases. In these instances the EXT events were changed to an out-migration event (OMG).

    Data appraisal

    Estimates of Sampling Error

    Not Applicable
    Data Appraisal

    CentreId MetricTable QMetric Illegal Legal Total Metric RunDate
    SN013 MicroDataCleaned Starts 86883 2017-05-19 15:12
    SN013 MicroDataCleaned Transitions 241970 241970 0 2017-05-19 15:12
    SN013 MicroDataCleaned Ends 86883 2017-05-19 15:12
    SN013 MicroDataCleaned SexValues 32 241938 241970 0 2017-05-19 15:12
    SN013 MicroDataCleaned DoBValues 241970 2017-05-19 15:12

    Access policy

    Archive where study is originally stored

    IRD: Niakhar (SN013)

    Data Access

    Access authority
    Name Affiliation URL Email
    iSHARE2 Heip desk INDEPTH http://indepth-ishare.org help-data@indepth-network.org
    Confidentiality
    Is signing of a confidentiality declaration required? Confidentiality declaration text
    yes This data is anonimised 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 organisations 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 from:

    "Niakhar HDSS INDEPTH Core Dataset 1984-2014 (Release 2017). Provided by the INDEPTH Network Data Repository. www.indepth-network.og http://www.indepth-network.org. doi: 10.7796/INDEPTH.SN013.CMD2014.v1"

    Disclaimer and copyrights

    Disclaimer

    The user of the data acknowledges that the orriginal collector of thr data, INDEPTH, and the relevant funding agencies bear no responsibility for the data's use or interpretation or inferences base 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 help-data@indepth-network.org http://indepth-ishare.org/howtouse
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