 ### Description

Dekaban estimated brain weight based on age and gender. The author is from the National Institutes of Neurological and Communicative Disorders and Stroke (NINCDS) at NIH.

Parameters:

(1) age group (see below)

(2) gender

Age

Age Group

0 to 10 days

1

0.5 years (4 to 8 months = 0.33 to 0.66 yrs)

2

1 year (9 to 18 months = 0.75 to 1.5 yrs)

3

2 years (19 to 30 months = 1.6 to 2.5 yrs)

4

3 years (31 to 43 months = 2.6 to 3.6 yrs)

5

4 to 5 years

6

6 to 7 years

7

8 to 9 years

8

10 to 12 years

9

13 to 15 years

10

16 to 18 years

11

19 to 21 years

12

22 to 30 years

13

31 to 40 years

14

41 to 50 years

15

51 to 55 years

16

56 to 60 years

17

61 to 65 years

18

66 to 70 years

19

71 to 75 years

20

76 to 80 years

21

81 to 85 years

22

>= 86 years

23

where:

• There is a gap in time between age groups 1 and 2.

Age Group

Gender

Formula for Brain Weight in Kilograms

1 to 5

male

(0.225 * (age group)) + 0.204

6 to 12

male

(0.026 * (age group)) + 1.156

13 to 23

male

(-0.016 * (age group)) + 1.655

1 to 5

female

(0.193 * (age group)) + 0.228

6 to 12

female

(0.03 * (age group)) + 0.999

13 to 23

female

(-0.015 * (age group)) + 1.517

Age Group

Gender

Formula for Body Weight in Kilograms

1 to 5

male

(3.254 * (age group)) - 0.348

6 to 12

male

(9.276 * (age group)) - 41.752

13 to 23

male

similar to group 12, with decline after 18

1 to 5

female

(2.912 * (age group)) - 0.268

6 to 12

female

(6.24 * (age group)) - 20.34 (see note)

13 to 23

female

similar to group 12, with decline after 18

where:

• The formula given for females in groups 6 to 12 in the paper is incorrect (= (0.276 * (age group) - 41.7). The equation above is based on mean weights from Table 3.

Age Group

Gender

Formula for Body Height in Meters

1 to 11

male

(0.120 * (age group)) + 0.365

12 to 18

male

similar to group 11

19 to 23

male

slight decline

1 to 11

female

(0.109 * (age group)) + 0.389

12 to 18

female

similar to group 11

19 to 23

female

slight decline

brain weight in kilograms up to age 44 years =

= (-3.62 / (body weight in kilograms)) + 1.449

Age Group

Gender

Formula for Ratio of Brain Weight in Kgs to Body Height in Meters (Index A)

1 to 10

male

(-0.099 * (age group)) + 13.976

11 to 23

male

(-0.016 * (age group)) + 2.362

1 to 10

female

(-1.213 * (age group)) + 14.577

11 to 23

female

(-0.038 * (age group)) + 2.922

Age Group

Gender

Formula for Ratio of Brain to Body Weight in Kilograms (Index B)

1 to 4

male

(19.631 * (age group)) + 63.77

6 to 11

male

(-9.147 * (age group)) +179.868

12 to 23

male

(-0.662 * (age group)) + 90.723

1 to 4

female

(18.29 * (age group)) + 61.53

6 to 11

female

(-6.795 * (age group)) + 151.476

12 to 23

female

(-0.695 * (age group)) + 89.241