Gambia Tobacco Survey 2017
Gambia, 2017
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Reference ID
gmb-etcp-gts-2017-v1
Producer(s)
Economics of Tobacco Control Project, Gambia Bureau of Statistics
Created on
Jul 22, 2019
Last modified
Jun 02, 2020
Page views
16007
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Identification
Survey ID Number
gmb-etcp-gts-2017-v1
Title
Gambia Tobacco Survey 2017
Country
| Name | Country code |
|---|---|
| Gambia | gha |
Study type
Household Survey [hh]
Abstract
The survey collected data on the daily smoking behaviour of adult smokers in The Gambia.
Kind of Data
Sample survey data
Unit of Analysis
Households and individuals
Version
Version Description
v1: Edited, anonymised data for public distribution
Version Date
2017
Scope
Notes
Respondents answered 13 questions on their household and 18 questions related to individuals. Household-level data collected includes household size, number of smokers, household facilities and amenities. Individual-level data was collected on monthly income, education attainment, and type and frequency of use of tobacco products.
Keywords
| Keyword |
|---|
| food |
| alcoholic beverages |
| tobacco products |
| imports |
| exports |
| prices |
Coverage
Geographic Coverage
The survey had national coverage
Geographic Unit
The lowest level of geographic aggregation covered by the data is local government area
Universe
The survey targeted adults aged 18 and above in sampled households in The Gambia
Producers and sponsors
Primary investigators
| Name | Affiliation |
|---|---|
| Economics of Tobacco Control Project | University of Cape Town |
| Gambia Bureau of Statistics | Government of The Gambia |
Funding Agency/Sponsor
| Name | Abbreviation | Role |
|---|---|---|
| Cancer Research UK | CRUK | data collector |
Sampling
Sampling Procedure
A sample of 2700 smokers was targeted from 135 enumeration areas. A total of 20 smokers was targeted in each EA. The specific steps for the selection of the EAs and smokers included the following stages:
Step 1: Sampling of EAs
From the full list of all 4,000 plus EAs in the Gambia, disaggregated by strata, EAs were randomly selected from within the specified strata/district based on the number of EAs
Step 2: Sampling of smokers/households in each EA
Random Number Table (RNT) sampling was used to select eligible households when the number of eligible households in an EA was more than 20 households. The team in an EA randomly selected a start point to administer the household questionnaire (up to 20 administered in each EA). Within each household, if a smoker was present and willing and eligible to be interviewed, then a second, individual questionnaire was administered. All households with eligible smokers in the EA were relisted. A sampling interval was determined for systematic random sampling method
3 starting numbers are randomly selected and the enumeration starting with the first random number selected in the first round of 20 households with smokers. If, after the first round of 20 households were interviewed, there were fewer than 20 questionnaires, the second random start number was used to select another set of 20 households to interview. This was repeated until at least 20 households were interviewed in the EA. All households were interviewed in EAs with fewer than 20 eligible households. If more than one smoker is present in the household, interviewers randomly selected one smoker to be interviewed
Step 1: Sampling of EAs
From the full list of all 4,000 plus EAs in the Gambia, disaggregated by strata, EAs were randomly selected from within the specified strata/district based on the number of EAs
Step 2: Sampling of smokers/households in each EA
Random Number Table (RNT) sampling was used to select eligible households when the number of eligible households in an EA was more than 20 households. The team in an EA randomly selected a start point to administer the household questionnaire (up to 20 administered in each EA). Within each household, if a smoker was present and willing and eligible to be interviewed, then a second, individual questionnaire was administered. All households with eligible smokers in the EA were relisted. A sampling interval was determined for systematic random sampling method
3 starting numbers are randomly selected and the enumeration starting with the first random number selected in the first round of 20 households with smokers. If, after the first round of 20 households were interviewed, there were fewer than 20 questionnaires, the second random start number was used to select another set of 20 households to interview. This was repeated until at least 20 households were interviewed in the EA. All households were interviewed in EAs with fewer than 20 eligible households. If more than one smoker is present in the household, interviewers randomly selected one smoker to be interviewed
Weighting
The inverse of three probabilities of selection were combined to design the weights:
1. The probability of selecting the EA - Number of EA selected/ Total number of EAs
2. The probability of selecting the 20 block of HHs - 20 households selected/Average number of households in an EA
Note that to estimate the average number of households in an EA the total number of households in an LGA were first divided by the total EAs in an LGA. The numbers were between 29 and 90 households per EA which gives an average of about 53 households per EA. Gambia's 2003 census report estimates that the average size of an EA is about 65 households or 500 people. Gambia's 2013 census found 217,000 households in total. Using the average of 53, the Project estimated 212,000 households.
3. The probability of selecting the smoking HH - smoker/Number of smokers in household
Note that all households with a smoker were selected for interviews, i.e. Probability=1. However, within each household, only one smoker was interviewed, based on the probabilities calculated
To calculate the base weights we these probabilities were multiplied by their inverses. The final weights were adjusted according to response rates at household and individual smoker levels.
1. The probability of selecting the EA - Number of EA selected/ Total number of EAs
2. The probability of selecting the 20 block of HHs - 20 households selected/Average number of households in an EA
Note that to estimate the average number of households in an EA the total number of households in an LGA were first divided by the total EAs in an LGA. The numbers were between 29 and 90 households per EA which gives an average of about 53 households per EA. Gambia's 2003 census report estimates that the average size of an EA is about 65 households or 500 people. Gambia's 2013 census found 217,000 households in total. Using the average of 53, the Project estimated 212,000 households.
3. The probability of selecting the smoking HH - smoker/Number of smokers in household
Note that all households with a smoker were selected for interviews, i.e. Probability=1. However, within each household, only one smoker was interviewed, based on the probabilities calculated
To calculate the base weights we these probabilities were multiplied by their inverses. The final weights were adjusted according to response rates at household and individual smoker levels.
Data Collection
Dates of Data Collection
| Start | End |
|---|---|
| 2017-11-19 | 2017-12-02 |
Data Collection Mode
Face-to-face [f2f]
Supervision
Data collection for the survey was granted ethics approval by the Ethics in Research Committee of the Faculty of Commerce at the University of Cape Town on 18 October 2016.
Data Collection Notes
Data collection was carried out by 4 field teams. Each team consisted of 1 supervisor, 4 interviewers and 1 driver. Sampled urban EAs were assigned to teams 1 and 2 and rural EAs were assigned to teams 3 and 4. The coordinators conducted field spot checks to ascertain that all households in the sampled EAs were listed and eligible households were interviewed and they checked that the forms were correctly completed.
Data Collectors
| Name | Abbreviation | Affiliation |
|---|---|---|
| Gambia Bureau of Statistics | GBS | Government of The Gambia |
| Cancer Research UK | CRUK |
Access policy
Contacts
| Name | Affiliation | URL | |
|---|---|---|---|
| DataFirst Helpdesk | University of Cape Town | support@data1st.org | www.support.data1st.org |
Access conditions
Public use files, available to all
Citation requirements
Economics of Tobacco Control Project. Gambia Tobacco Survey 2017 [dataset]. Version 1. Cape Town: Economics of Tobacco Control Project (ETCP) [producers], 2017. Cape Town: DataFirst [distributors], 2019. DOI: https://doi.org/10.25828/d7z7-2k50
Access authority
| Name | Affiliation | URL | |
|---|---|---|---|
| DataFirst | University of Cape Town | support@data1st.org | Link |
Metadata production
Producers
| Name | Affiliation | Role |
|---|---|---|
| DataFirst | University of Cape Town | Metadata producer |
Date of Metadata Production
2020-05-18
DDI Document version
Version 3