<prompt> Broca;s index isWeight minus 100Height minus 100height weightWeight height  <response>: The Broca Index, also known as the Broca formula was devised back in 1871 by the French physician, surgeon and anthropologist Paul Broca, as a measure of the normal weight of a person. Broca Index Normal Weight Body Height - 100. Ref: Park 25th edition Pgno : 418 