The Centers for Disease Control (CDC) published data on the body dimensions of pediatric patients in 2000. This included data on the head circumference of boys aged from 0 to 36 months.
Equations derived in JMP
predicted head circumference in cm =
= (A * ((age in months)^3)) + (B * ((age in months)^2)) + (C * (age in months)) + D
NOTE: The tables should be validated prior to clinical use.
|
interval in months |
percentile |
((age in months)^3) |
((age in months)^2) |
(age in months) |
constant |
|---|---|---|---|---|---|
|
0 - 6.5 |
3rd |
0.0292941 |
-0.483183 |
3.446085 |
31.559012 |
|
|
5th |
0.0276313 |
-0.458159 |
3.2979798 |
32.213584 |
|
|
10th |
0.0259539 |
-0.430214 |
3.11818 |
33.140193 |
|
|
25th |
0.023807 |
-0.394379 |
2.8873406 |
34.524548 |
|
|
50th |
0.0223245 |
-0.368621 |
2.7149265 |
35.860182 |
|
|
75th |
0.0211244 |
-0.348656 |
2.5900395 |
37.049136 |
|
|
90th |
0.0201614 |
-0.334466 |
2.5108658 |
38.017611 |
|
|
95th |
0.0195189 |
-0.325275 |
2.4680314 |
38.563324 |
|
|
97th |
0.0193778 |
-0.322761 |
2.4539501 |
38.894931 |
|
6.5 - 18.5 |
3rd |
0.0009994 |
-0.056404 |
1.2253795 |
35.687355 |
|
|
5th |
0.0009353 |
-0.053436 |
1.1826583 |
36.173337 |
|
|
10th |
0.0009353 |
-0.052587 |
1.1614295 |
36.754897 |
|
|
25th |
0.0008741 |
-0.049108 |
1.1049563 |
37.801018 |
|
|
50th |
0.0007896 |
-0.044831 |
1.0406168 |
38.960246 |
|
|
75th |
0.0006993 |
-0.040759 |
0.98502 |
40.065095 |
|
|
90th |
0.0007139 |
-0.041141 |
0.9899464 |
40.833899 |
|
|
95th |
0.0007284 |
-0.041517 |
0.9934842 |
41.302287 |
|
|
97th |
0.0006993 |
-0.040325 |
0.9791558 |
41.664412 |
|
18.5 - 36 |
3rd |
0.0000985 |
-0.011715 |
0.4722156 |
40.023349 |
|
|
5th |
0.0001005 |
-0.01177 |
0.4778128 |
40.233798 |
|
|
10th |
0.0000989 |
-0.011515 |
0.4772324 |
40.646806 |
|
|
25th |
0.0000903 |
-0.010702 |
0.4669884 |
41.413027 |
|
|
50th |
0.0000739 |
-0.009201 |
0.4351624 |
42.494386 |
|
|
75th |
0.0000859 |
-0.010171 |
0.4705399 |
42.994124 |
|
|
90th |
0.0000849 |
-0.009981 |
0.468707 |
43.791955 |
|
|
95th |
0.0000772 |
-0.00933 |
0.4534853 |
44.39588 |
|
|
97th |
0.0000778 |
-0.009372 |
0.4555602 |
44.690421 |
