Randomisation and masking
A total of 48 clusters, divided into an inner core area, and an outer buffer zone of 300 m minimum [The two LLINs were the same colour and shape and only distinguishable by label codes and different coloured thread stitch added during the manufacturing process. Participants and field staff collecting the data were blinded to the type of LLINs in each study group but not to the IRS treatment allocation.