NORMAL-WEIGHT OF THE BRAIN IN ADULTS, REF ERRED TO AGE, SEX, HEIGHT AND BODY-WEIGHT

Based on more than 8000 autopsies of male and female patients without brain diseases the normal brain weight of adult males and females in r elation to sex, age, body-weight, and body-height as well as Body Mass Index were calculated. The average brain weight of the adult male was 1336 gr; for the adult female 1198 gr. With increasing age, brain wei ght decreases by 2.7 gr in males, and by 2.2 gr in females per year. P er centimeter body height brain weight increases independent of sex by an average of about 3.7 gr. Body Mass Index is of minor importance an d only relevant in males. Based on these data the independent variable s, age and height, were for the first time combined in a nomogram for the calculation of brain weight. The mathematical functions were integ rated in a computer program which facilitates the calculation of norma l brain weights in individual cases.