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 |
