The chest circumference in Caucasian infants born at 25-44 weeks gestation after last menstrual period were measured and the distribution determined.
|
weeks gestation |
mean-2 S.D. |
mean |
mean+2 S.D. |
|
25 |
16.9 |
19.8 |
22.7 |
|
26 |
17.3 |
20.2 |
23.1 |
|
27 |
17.9 |
20.8 |
23.7 |
|
28 |
18.4 |
21.3 |
24.2 |
|
29 |
19.1 |
22.1 |
25.1 |
|
30 |
20 |
23 |
26 |
|
31 |
20.9 |
24 |
27.1 |
|
32 |
22 |
25.1 |
28.2 |
|
33 |
23.2 |
26.3 |
29.4 |
|
34 |
24.5 |
27.6 |
30.7 |
|
35 |
25.5 |
28.7 |
31.9 |
|
36 |
26.6 |
29.8 |
33 |
|
37 |
27.6 |
30.9 |
34.2 |
|
38 |
28.9 |
32.2 |
35.5 |
|
39 |
29.6 |
32.9 |
36.2 |
|
40 |
30 |
33.4 |
36.8 |
|
41 |
30.2 |
33.6 |
37 |
|
42 |
30.1 |
33.5 |
36.9 |
|
43 |
29.7 |
33.2 |
36.7 |
|
44 |
29.5 |
33 |
36.5 |
Approximating Equations (JMP)
mean - 2SD =
= (0.0000269 * ((week gestation)^5)) - (0.004734 * ((week gestation)^4)) + (0.3245948 * ((week gestation)^3)) - (10.84142 * ((week gestation)^2)) + (177.34534 * (week gestation)) -1126.029
mean =
= (0.0000251 * ((week gestation)^5)) - (0.004417 * ((week gestation)^4)) + (0.3023981 * ((week gestation)^3)) - (10.07007 * ((week gestation)^2)) + (164.0776 * (week gestation)) -1032.987
mean + 2SD =
= (0.0000233 * ((week gestation)^5)) - (0.0041 * ((week gestation)^4)) + (0.2802014 * ((week gestation)^3)) - (9.298723 * ((week gestation)^2)) + (150.80986 * (week gestation)) -939.9441
Specialty: Obstetrics & Gynecology, Pedatrics
ICD-10: ,
