Oral glucose tolerance test.
Participants underwent a standard oral glucose tolerance test after an overnight fast of at least 8 hours. A fasting venous blood glucose was collected, and participants were then given 82.5g glucose monohydrate (equivalent to 75g anhydrous glucose) dissolved in 250ml of water. Repeat venous blood samples were taken at 60 and 120 minutes. Samples were immediately centrifuged at study sites and plasma stored on ice. All samples were analysed centrally at the MRC/UVRI and LSHTM Clinical and Diagnostics Laboratory in Entebbe, within 4 hours of collection, or stored at -80°C for subsequent analysis.