Final answer:
A low SDI close to 1 suggests high disease burden.
Step-by-step explanation:
A low SDI (Socio-Demographic Index) close to 1 suggests high disease burden. The SDI is a measure that combines average income, educational attainment, and fertility rate to categorize countries into five development levels. A low SDI indicates lower development and is associated with higher disease burden, which is the impact of a disease on a population as measured by financial cost, mortality, morbidity, or other indicators.