<prompt> Sullivan index is an index forLife free of disabilityLife ExpectancyEarning capacityPopulation index  <response>: Sullivans index also known as Disability Free Life Expectancy DFLE is a method to compute life expectancy free of disability. It is calculated by formula:Life expectancy minus duration of disability Ref: 25th edition, Parks Textbook of Preventive and Social Medicine, Page no. 26 