Problem: The findings of the Betz 30year study of temperament concluded all of the following except: Group of answer choices It infers that genetics play a significant role in disease susceptibility. Of the four types studied, the deltas had the highest disease rate. That selfreliance and spontaneity were important low disease rate characteristics. That Gammas were almost three times as likely to suffer from a serious illness than other types. All of the above. Need Assignment Help?