Dr Smith Studies a Group of 1,000 People Who Have

Multiple Choice

Dr. Smith studies a group of 1,000 people who have schizophrenia and who also have identical twins. He finds that 47% of the identical twins also develop this disease. The type of statistical information Dr. Smith's study reveals is called:

A) concordance
B) an H-E (Heredity-Environment) Index
C) a genetic-based percentage
D) analysis of variance