<prompt> Sullivan index denotes: September 2006Life expectancy at bihLife expectancy excluding disability free periodContraceptive failure rateHookworm density in stool  <response>: Ans. B: Life expectancy excluding disability free period This index expectation of life free of disability is computed by subtracting from the the life expectancy the probable duration of bed disability and inability to perform major activities, according to cross-sectional data from the population surveys. It is one of the most advanced indicators of disability rates currently available. 