### Description

The birthweight of 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. 25 650 850 1050 26 703 933 1163 27 746 1016 1286 28 813 1113 1413 29 898 1228 1558 30 1023 1373 1723 31 1140 1540 1940 32 1277 1727 2177 33 1400 1900 2400 34 1553 2113 2673 35 1717 2347 2977 36 1889 2589 3289 37 2118 2868 3618 38 2333 3133 3933 39 2500 3360 4220 40 2560 3480 4400 41 2617 3567 4517 42 2553 3513 4473 43 2446 3416 4386 44 2414 3384 4354

Approximating Equations (JMP)

mean - 2SD =

= (0.0016482 * ((week gestation)^6)) - (0.338432 * ((week gestation)^5)) + (28.671586 * ((week gestation)^4)) - (1283.42 * ((week gestation)^3)) + (32033.829 * ((week gestation)^2)) - (422888.2 * (week gestation)) + 2307934.7

mean =

= (0.0016433 * ((week gestation)^6)) - (0.33604 * ((week gestation)^5)) + (28.331873 * ((week gestation)^4)) - (1261.357 * ((week gestation)^3)) + (31299.662 * ((week gestation)^2)) - (410654 * (week gestation)) + 2226933.4

mean + 2SD =

= (0.0016384 * ((week gestation)^6)) - (0.333649 * ((week gestation)^5)) + (27.99216 * ((week gestation)^4)) - (1239.293 * ((week gestation)^3)) + (30565.495 * ((week gestation)^2)) - (398419.8 * (week gestation)) + 2145932.1

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