IRS	Indoor residual spraying
LMICs	Low-income and middle-income countries
ETS	Environmental Tobacco Smoke
OR	Odds ratio
SA	South Africa
ISAAC	International Study of Childhood Asthma and Allergies in Children
UNIVEN	University of Venda
DHET	Department of Higher Education and training
WHO	World Health Organization
REDCap	Research Electronic Data Capture