AHHA Malawi Trial Dataset – Codebook

Permanent identifier

https://doi.org/10.17037/DATA.00003123

Data creators

Joy, E (Principal Investigator), Sturgess, J (Data Manager) and Allen, E (Co-Investigator)

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.

Additional information

This dataset is an update to the dataset published at 10.17037/DATA.00001993. It contains 12 additional measurements (FER_base_ugL, sTFR_base_mgL, BodyIronStores_base_mgkgbodyweig, RBP_base_RE_umolL, CRP_base_mgL, AGP_base_gL, FER_end_ugL, sTFR_end_mgL, BodyIronStores_end_mgkgbodyweig, RBP_end_RE_umolL, CRP_end_mgL, AGP_end_gL).

Data capture method

Experiment: Field Intervention

Description of data capture:

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.

Date:

Keywords

Selenium, Agronomic Biofortification, Maize

Project information

Project title Funder name 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 https://doi.org/10.1186/ISRCTN85899451

Codebook

The following variables are contained within the AHHA-Malawi-trial-results-dataset. The value 'NA' represents 'Not Applicable'.

Variable name Variable label Answer code Answer label
participant-label Unique participant ID - unlinked from main dataset to ensure anonymity    
group Group type    
    0 Control
    1 Intervention
hh household ID - unlinked from main dataset to ensure anonymity    
adult_child Demographic group    
    Adult Adult
    Child Child
age_group Age group    
    1 5-10 years
    2 20-29 years
    3 30-39 years
    4 40 years or over
se_base plasma selenium concentration at baseline, µg/L    
se_end plasma selenium concentration at endline, µg/L    
hb_base whole blood haemoglobin concentration at baseline, g/dL    
hb_end whole blood haemoglobin concentration at endline, g/dL    
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    
    Yes Yes
    No No
    Not sure Not sure
    NULL Not completed
maxstools What is the maximum number of stools in a 24 h period during the diarrhoeal episode?    
diarrhoea_prolonged Did the diarrhoea last between 7-13 days?    
    Yes Yes
    No No
    Not sure Not sure
    NULL Not completed
diarrhoea_blood Did the participant have any blood in their stools?    
    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    
    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?    
    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?    
    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?    
    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?    
    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
se-intake-base-visit1 dietary selenium intake at baseline, µg/day    
se-intake-base-repeat dietary selenium intake at baseline at repeat visit for randomly-selected subset, µg/day    
se-intake-end dietary selenium intake at endline, µg/day    
se-intake-end-repeat dietary selenium intake at endline at repeat visit for randomly-selected subset, µg/day    
pregnant-end self-reported pregnancy status    
    y Yes
    NULL Not completed
lactating-end self-reported lactation status    
    y Yes
    NULL Not completed
FER_base_ugL Serum ferritin concentration at baseline    
sTFR_base_mgL Serum transferrin receptor concentration at baseline    
BodyIronStores_base_mgkgbodyweig Body iron stores    
RBP_base_RE_umolL Retinol binding protein at baseline    
CRP_base_mgL C-reactive protein concentration at baseline    
AGP_base_gL Αlpha-1-acid glycoprotein concentration at baseline    
FER_end_ugL Serum ferritin concentration at endline    
sTFR_end_mgL Serum transferrin receptor concentration at endline    
BodyIronStores_end_mgkgbodyweig Body iron stores    
RBP_end_RE_umolL Retinol binding protein at endline    
CRP_end_mgL C-reactive protein concentration at endline    
AGP_end_gL Αlpha-1-acid glycoprotein concentration at endline