AHHA Malawi Trial Dataset v3 – Data Codebook

Persistent identifier

10.17037/DATA.00003400

Description

The Alleviating Hidden Hunger with Agronomy (AHHA) Malawi trial sought to test the efficacy of alleviating selenium deficiency through consumption of maize flour enriched with fertilizers in a Malawi-based context. The anonymised dataset contains outcome results of the investigation. This dataset is an update to the version published at 10.17037/DATA.00003123.

Data collection methods

Participant demographic information, morbidity outcomes and dietary information were captured through interviewer-administered questionnaires. Blood haemoglobin concentrations were measured in the field by trained Research Assistants. Serum selenium concentrations were measured by ICPMS.

Key dates

Keywords

Selenium, Agronomic Biofortification, Maize

Language of written material

English

Project information

Project name Funder/sponsor Grant number Notes
Can dietary mineral deficiencies in a rural Malawi population be improved through the consumption of maize flour enriched using micronutrient fertilizers? Bill & Melinda Gates Foundation INV-009129 ISRCTN85899451 10.1186/ISRCTN85899451

Additional information

This dataset is an update to the version published at 10.17037/DATA.00003123.

Creators

Forename Surname Faculty / Dept Institution Role ORCID
Edward Joy Faculty of Epidemiology and Population Health / Department of Population Health London School of Hygiene & Tropical Medicine Data Creator 0000-0002-0106-866X
Joanna Sturgess Faculty of Epidemiology and Population Health / Department of Medical Statistics London School of Hygiene & Tropical Medicine Data Creator 0000-0001-7312-4598
Elizabeth Allen Faculty of Epidemiology and Population Health / Department of Medical Statistics London School of Hygiene & Tropical Medicine   0000-0002-2689-6939

File description

Filename Description Access status Licence
AHHA-Malawi-dataset-v3 AHHA Malawi trial results dataset version 3 Open Creative Commons Attribution (CCBY)
AHHA-Malawi-dataset-v3-codebook Codebook for AHHA Malawi trial results dataset Open Creative Commons Attribution (CCBY)

Data Codebook

The third version of the AHHA Malawi Trial dataset contains the following variables.

Variable Name Variable Label Answer Label Answer Code Variable Type
participantlabel Participant ID number     Numeric
group Group     Numeric
      1  
      0  
hh Household ID group Open ended   Numeric
adult_child Demographic group     String
      Adult  
      Child  
age_group Age group     Numeric
    5-10 years 1  
    20-29 years 2  
    30-39 years 3  
    40 years or over 4  
se_base plasma selenium concentration at baseline, µg/L     String
    Not applicable NA  
se_end plasma selenium concentration at endline, µg/L     String
         
hb_base whole blood haemoglobin concentration at baseline, g/dL     String
    Not applicable NA  
hb_end whole blood haemoglobin concentration at endline, g/dL     String
    Not applicable NA  
diarrhoea Has the participant suffered diarrhoea in the past two weeks? Diarrhoea is defined as 3 or more watery stools over a 24 hour period     String
    Not applicable NA  
    No No  
    Not sure Not sure  
    Yes Yes  
maxstools What is the maximum number of stools in a 24 hour period during the diarrhoeal episode?     String
    Not applicable NA  
    3 3  
    4 to 5 4 to 5  
    6 to 7 6 to 7  
diarrhoea_prolonged Did the diarrhoea last between 7-13 days?     String
    Yes Yes  
    No No  
    Not sure Not sure  
    NULL Not completed  
        String
diarrhoea_blood Did the participant have any blood in their stools?     String
    Yes Yes  
    No No  
    NULL Not completed  
fever Has the participant suffered fever in the past 2 weeks? Fever is defined as a high temperature     String
    Fever for 1–2 days Fever for 1–2 days  
    Fever for 3–4 days Fever for 3–4 days  
    Fever for 5+ days Fever for 5+ days  
    No fever No fever  
    Not sure/would rather not say Not sure/would rather not say  
    NULL Not completed  
vomiting Has the participant suffered vomiting in the past 2 weeks?     String
    Vomiting for 1–2 days Vomiting for 1–2 days  
    Vomiting for 3–4 days Vomiting for 3–4 days  
    Not sure/would rather not say Not sure/would rather not say  
    No vomiting No vomiting  
    NULL Not completed  
cough Has the participant had an illness with a cough at any time in the last 2 weeks?     String
    Yes Yes  
    No No  
    Not sure Not sure  
    Would rather not say Would rather not say  
    NULL Not completed  
breathing Has the participant had fast, short, rapid breaths or difficulty breathing at any time in the last 2 weeks?     String
    Yes Yes  
    No No  
    Not sure Not sure  
    Would rather not say Would rather not say  
    NULL Not completed  
chest Was the fast or difficult breathing due to a problem in the chest or to a blocked or runny nose?     String
    Both Both  
    Chest only Chest only  
    Don't know/would rather not say Don't know/would rather not say  
    Nose only Nose only  
    Other (specify) Other  
    NULL Not completed  
seintakebasevisit1 dietary selenium intake at baseline, µg/day     String
seintakebaserepeat dietary selenium intake at baseline at repeat visit for randomly-selected subset, µg/day     String
seintakeend dietary selenium intake at endline, µg/day     String
seintakeendrepeat dietary selenium intake at endline at repeat visit for randomly-selected subset, µg/day     String
pregnantend self-reported pregnancy status     String
    y Yes  
    NULL Not completed  
lactatingend self-reported lactation status     String
    y Yes  
    NULL Not completed  
FER_base_ugL Serum ferritin concentration at baseline     String
sTFR_base_mgL Serum transferrin receptor concentration at baseline     String
BodyIronStores_base_mgkgbodyweig Body iron stores     String
RBP_base_RE_umolL Retinol binding protein at baseline     String
CRP_base_mgL C-reactive protein concentration at baseline     String
AGP_base_gL Αlpha-1-acid glycoprotein concentration at baseline     String
FER_end_ugL Serum ferritin concentration at endline     String
sTFR_end_mgL Serum transferrin receptor concentration at endline     String
BodyIronStores_end_mgkgbodyweig Body iron stores     String
RBP_end_RE_umolL Retinol binding protein at endline     String
CRP_end_mgL C-reactive protein concentration at endline     String
AGP_end_gL Αlpha-1-acid glycoprotein concentration at endline     String
hh_adults Number of adults in household Open ended   Numeric
children_over_1 Number of children over 1 in household Open ended   Numeric
total_hh Total number in household Open ended   Numeric
water What is the main source of water for the dwelling?     Numeric
    Piped into dwelling 1  
    Piped to yard 2  
    Piped to neighbour 3  
    Public tap stand 4  
    Tube well or borehole 5  
    Protected well 6  
    Unprotected well 7  
    Unprotected spring 8  
    Surface water (river/dam/lake/pond/stream/canal/irrigation channel) 9  
    Other 10  
toilet What toilet facilities does the household use?     Numeric
    Ventilated imporved pit latrine 1  
    Pit latrine with slab 2  
    Pit latrine without slab/open pit 3  
    No facility/bush/field 4  
    Pit latrine with slab - shared 5  
    Pit latrine without slab/open pit - shared 6  
    Other 7  
fuel What is the main cooking fuel used in the household?     Numeric
    Electricity 1  
    Charcoal 2  
    Wood 3  
    Grass/straw/shrubs 4  
    Other 5  
floor What is the main floor material of the household?     Numeric
    Earth/sand 1  
    Dung 2  
    Cement 3  
    Other 4  
roof What is the main roof material of the household?     Numeric
    No roof 1  
    Thatch 2  
    Palm/bamboo 3  
    Metal 4  
    Wood 5  
    Other 6  
wall What is the main wall material of the household?     Numeric
    Uncovered adobe (wood plastered with mud) 1  
    Covered adobe (wood plastered with mud, with paint or wall paper) 2  
    Bricks 3  
    Other 4  
electric Electricity     Numeric
    Yes 1  
    No 2  
radio Radio     Numeric
    Yes 1  
    No 2  
tv Television     Numeric
    Yes 1  
    No 2  
telephone Telephone (not mobile)     Numeric
    Yes 1  
    No 2  
compupter Computer     Numeric
    Yes 1  
    No 2  
fridge Refrigerator     Numeric
    Yes 1  
    No 2  
kolo Koloboyi     Numeric
    Yes 1  
    No 2  
paraffin Paraffin lamp     Numeric
    Yes 1  
    No 2  
lamp Lamp/torch     Numeric
    Yes 1  
    No 2  
bed Bed with matress     Numeric
    Yes 1  
    No 2  
sofa Sofa set     Numeric
    Yes 1  
    No 2  
watch Watch     Numeric
    Yes 1  
    No 2  
mobile Mobile telephone     Numeric
    Yes 1  
    No 2  
bike Bicycle     Numeric
    Yes 1  
    No 2  
motorbike Motorbike or scooter     Numeric
    Yes 1  
    No 2  
cart Animal-drawn cart     Numeric
    Yes 1  
    No 2  
car Car or truck     Numeric
    Yes 1  
    No 2  
boat Boat with a motor     Numeric
    Yes 1  
    No 2  
bank Bank account     Numeric
    Yes 1  
    No 2  
own_home Does the household own their house?     Numeric
    Yes 1  
    No 2  
own_land Does the household own land?     Numeric
    Yes 1  
    No 2  
land_area What area of land does the household own?     Numeric
    <0.5 hectares 1  
    0.5-2 hectares 2  
    2-5 hectares 3  
    >5 hectares 4  
    Don't know 5  
income1       Numeric
    Subsistence farming 1  
    Tobacco 2  
    Paid employment 3  
    Other 4  
income2       Numeric
    Subsistence farming 1  
    Tobacco 2  
    Paid employment 3  
    Other 4  
income3       Numeric
    Subsistence farming 1  
    Tobacco 2  
    Paid employment 3  
    Other 4  
education_hh What is the highest level of education completed by the household head?     Numeric
    No formal education 1  
    Primary school 2  
    Secondary school 3  
    Higher 4  
education_woman What is the highest level of education completed by the adult woman participant?     Numeric
    No formal education 1  
    Primary school 2  
    Secondary school 3  
    Higher 4  
livestock Does the household own any livestock?     Numeric
    Yes 1  
    No 2  
milk_cows Does the household own any milk cows/bulls?     Numeric
    None 1  
    1 to 4 2  
    5 to 9 3  
    10+ 4  
other_cattle Does the household own any other cattle?     Numeric
    None 1  
    1 to 4 2  
    5 to 9 3  
    10+ 4  
mules Does the household own any mules or donkeys?     Numeric
    None 1  
    1 to 4 2  
    5 to 9 3  
    10+ 4  
goat Does the household own any goats?     Numeric
    None 1  
    1 to 4 2  
    5 to 9 3  
    10+ 4  
pigs Does the household own any pigs?     Numeric
    None 1  
    1 to 4 2  
    5 to 9 3  
    10+ 4  
chickens Does the household own any chickens?     Numeric
    None 1  
    1 to 9 2  
    10 to 29 3  
    30+ 4  
poultry Does the household own any other poultry?     Numeric
    None 1  
    1 to 9 2  
    10 to 29 3  
    30+ 4