Table 6.
Mean weight gain from 1 week after birth to 34 weeks of 4 NICHD cohorts and the 3 PreM Growth Study cohorts
| NICHD cohorts | 688 g* | 950 g | 1150 g |
|---|---|---|---|
| N |
197 |
191 |
168 |
| Gestational age (mean) |
25.4 |
27.6 |
29.0 |
| Small for gestational age (%) |
45.4 |
18.5 |
22.8 |
| Weight gain (g/kg/d) |
14.0 |
14.6 |
16.0 |
| Regain birthweight (days) |
16.6 +/− 12.3*** |
14.4 +/− 9.7*** |
13.2 +/− 8.5*** |
| PreM Growth study cohorts |
664 g |
992 g |
1084 g |
| N |
193 |
429 |
160 |
| Gestational age (mean) |
24.4 |
27.0 |
29.6 |
| Small for gestational age (%) |
1.3 |
8.0 |
26.2 |
| Weight gain (g/kg/d) ** |
13.1 |
15.2 |
14.8 |
| Regain birthweight (days) | 12.2 +/− 5.9*** | 12.4 +/− 5.1*** | 10.1 +/− 4.1*** |
* Weighted average of the NICHD 550 and 750 gram groups.
** Weight gain was calculated from when birthweight was regained to 2 kilograms.
*** p < 0.001.