n | Birth weight (g) | Crown-heel length (cm) | Head circumference (cm) | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Gestation (weeks) | 1982–86 | Present | 1982–86 | Present | p Value | 1982–86 | Present | p Value | 1982–86 | Present | p Value |
Values are mean (SD). | |||||||||||
27 | 20 | 37 | 965 (148) | 1024 (197) | 0.247 | 36.6 (1.7) | 36.4 (1.7) | 0.673 | 25.6 (0.9) | 25.1 (1.2) | 0.109 |
28 | 30 | 46 | 1095 (157) | 1140 (168) | 0.245 | 37.4 (1.8) | 37.7 (2.1) | 0.522 | 26.4 (1.0) | 26.0 (1.3) | 0.157 |
29 | 45 | 62 | 1239 (210) | 1259 (178) | 0.596 | 38.5 (1.3) | 39.1 (2.4) | 0.131 | 26.9 (1.2) | 26.9 (1.4) | 1.000 |
30 | 41 | 75 | 1405 (197) | 1471 (221) | 0.113 | 39.7 (2.1) | 40.7 (1.6) | 0.005 | 27.8 (1.2) | 28.1 (1.5) | 0.273 |
31 | 52 | 66 | 1598 (208) | 1578 (273) | 0.663 | 41.1 (2.1) | 41.9 (2.3) | 0.054 | 28.5 (1.2) | 28.7 (1.8) | 0.492 |
32 | 88 | 81 | 1798 (196) | 1793 (389) | 0.915 | 42.6 (2.0) | 42.9 (2.4) | 0.377 | 29.3 (1.7) | 29.6 (1.7) | 0.253 |
33 | 97 | 154 | 1975 (217) | 2022 (347) | 0.233 | 43.8 (2.1) | 44.6 (2.4) | 0.007 | 30.0 (1.6) | 30.6 (1.5) | 0.003 |
34 | 125 | 211 | 2128 (247) | 2223 (357) | 0.009 | 45.5 (2.4) | 45.5 (2.2) | 1.000 | 30.7 (1.5) | 31.1 (1.3) | 0.011 |
35 | 154 | 281 | 2368 (294) | 2470 (436) | 0.010 | 46.7 (2.3) | 46.9 (2.3) | 0.386 | 31.5 (1.4) | 32.1 (1.4) | <0.001 |
36 | 174 | 486 | 2620 (350) | 2773 (410) | <0.001 | 47.1 (1.9) | 48.1 (2.0) | <0.001 | 32.5 (1.3) | 33.0 (1.3) | <0.001 |
37 | 416 | 783 | 2830 (376) | 2997 (407) | <0.001 | 47.9 (2.5) | 48.9 (1.9) | <0.001 | 33.2 (1.5) | 33.4 (1.1) | 0.010 |
38 | 938 | 1926 | 3025 (342) | 3144 (388) | <0.001 | 48.7 (1.7) | 49.6 (1.7) | <0.001 | 33.4 (1.3) | 33.8 (1.2) | <0.001 |
39 | 1926 | 2522 | 3112 (315) | 3246 (377) | <0.001 | 49.0 (1.7) | 50.1 (1.7) | <0.001 | 33.8 (1.5) | 34.1 (1.1) | <0.001 |
40 | 2145 | 2277 | 3192 (322) | 3349 (400) | <0.001 | 49.4 (1.8) | 50.6 (1.7) | <0.001 | 34.1 (1.5) | 34.4 (1.2) | <0.001 |
41 | 1442 | 1049 | 3227 (331) | 3433 (418) | <0.001 | 49.8 (1.7) | 50.9 (1.7) | <0.001 | 34.3 (1.1) | 34.7 (1.2) | <0.001 |
42 | 752 | 207 | 3265 (341) | 3477 (417) | <0.001 | 49.8 (1.9) | 51.3 (1.8) | <0.001 | 34.5 (1.1) | 34.8 (1.2) | <0.001 |