Table 6 Birth weight means and standard deviations for each developmental milestone onset age by birth weight category
Birth weight category | Developmental milestone | Mean onset age in months (standard deviations); n | # Premature; # late pre-term (34 to 36Â weeks) | Birth weight means in grams (standard deviations) |
|---|---|---|---|---|
ELBW | Rolling | 5.50 (3.53); 0 | 2; 0 | 765.42 (200.46) |
| Â | Sitting | 8.00 (1.41); 0 | 2; 0 | Â |
| Â | Crawling | 10.50 (0.71); 0 | 3; 0 | Â |
| Â | Walking | 13.00 (1.73); 0 | 3; 0 | Â |
| Â | Solids | 10.50 (2.12); 0 | 2; 0 | Â |
| Â | Words | 24.00 (8.49); 0 | 2; 0 | Â |
| Â | Sentences | 54.00 (0); 0 | 1; 0 | Â |
VLBW | Rolling | 3.80 (0.84); 0 | 5; 1 | 1264.37 (157.33) |
| Â | Sitting | 8.00 (2.16); 0 | 4; 0 | Â |
| Â | Crawling | 9.58 (2.29); 0 | 6; 1 | Â |
| Â | Walking | 14.75 (2.25); 0 | 7; 1 | Â |
| Â | Solids | 9.67 (1.15); 0 | 3; 0 | Â |
| Â | Words | 15.79 (8.64); 0 | 6; 1 | Â |
| Â | Sentences | 24.60 (12.80); 0 | 4; 0 | Â |
LBW | Rolling | 5.55 (2.34);19 | 16; 8 | 2309.70 (193.98) |
| Â | Sitting | 7.62 (1.62); 23 | 19; 10 | Â |
| Â | Crawling | 9.79 (2.64); 23 | 19; 9 | Â |
| Â | Walking | 15.17 (3.48); 28 | 24; 13 | Â |
| Â | Solids | 11.24 (4.25); 17 | 14; 8 | Â |
| Â | Words | 14.04 (7.08); 24 | 20; 9 | Â |
| Â | Sentences | 25.28 (12.08); 21 | 16; 6 | Â |
NBW | Rolling | 4.86 (2.20); 269 | 36; 13 | 3414.71 (369.67) |
| Â | Sitting | 6.65 (1.60); 326 | 47; 14 | Â |
| Â | Crawling | 8.68 (2.56); 329 | 46; 15 | Â |
| Â | Walking | 13.39 (3.63); 455 | 71; 20 | Â |
| Â | Solids | 9.07 (3.73); 222 | 26; 6 | Â |
| Â | Words | 14.05 (6.89); 346 | 53; 15 | Â |
| Â | Sentences | 22.11 (9.80); 299 | 45; 10 | Â |
HBW | Rolling | 4.32 (1.73); 48 | 0; 0 | 4315.54 (280.37) |
| Â | Sitting | 6.61 (1.89); 61 | 0; 0 | Â |
| Â | Crawling | 8.40 (1.86); 62 | 0; 0 | Â |
| Â | Walking | 13.05 (2.75); 85 | 0; 0 | Â |
| Â | Solids | 8.87 (3.84); 39 | 0; 0 | Â |
| Â | Words | 12.61 (5.23); 64 | 0; 0 | Â |
| Â | Sentences | 18.01 (7.74); 49 | 0; 0 | Â |