Table 4 Weight z--scores and percent of infants weighting less than the 10th percentile*
All infants | 23 to 25 wks | 26 to 28 weeks | 29 to 31 weeks | |
|---|---|---|---|---|
Birth vs. FIGR-2013 [21] | ||||
median | −0.1 | 0.1 | 0.1 | −0.9 |
Average | −0.2 | 0.0 | 0.0 | −0.9 |
Standard deviation | 0.8 | 0.8 | 0.8 | 0.6 |
Count | 978 | 225 | 541 | 212 |
% less than 10th percentile | 11% | 6% | 7% | 26% |
2 weeks postnatal age vs. FIGR-2013 | ||||
median | −1.0 | −0.8 | −0.8 | −1.6 |
Average | −1.0 | −0.8 | −0.8 | −1.6 |
Standard deviation | 0.6 | 0.6 | 0.6 | 0.6 |
Count | 862 | 193 | 485 | 184 |
% less than 10th percentile | 31% | 22% | 20% | 68% |
37 weeks gestational age vs. FIGR-2013 | ||||
median | −1.7 | −1.9 | −1.5 | −2.1 |
Average | −1.7 | −1.9 | −1.6 | −2.1 |
Standard deviation | 0.9 | 1.0 | 1.0 | 1.0 |
Count | 696 | 169 | 382 | 145 |
% less than 10th percentile | 65% | 75% | 60% | 78% |
40 weeks gestational age vs. FIGR-2013 | ||||
median | −1.6 | −1.8 | −1.3 | −1.9 |
Average | 1.3 | 1.3 | 1.3 | 1.2 |
Standard deviation | −1.5 | −1.7 | −1.3 | −1.8 |
Count | 584 | 144 | 316 | 124 |
% less than 10th percentile | 55% | 63% | 49% | 62% |
40 weeks gestational age vs. WHO Growth Standard [16] | ||||
median | −0.9 | −1.1 | −0.7 | −1.2 |
Average | 1.1 | 1.2 | 1.1 | 1.1 |
Standard deviation | −0.8 | −1.0 | −0.6 | −1.1 |
Count | 584 | 144 | 315 | 124 |
% less than 10th percentile | 35% | 39% | 28% | 47% |
50 weeks post-menstrual age vs. WHO Growth Standard | ||||
median | −1.1 | −1.2 | −1.0 | −1.2 |
Average | −1.2 | −1.3 | −1.1 | −1.3 |
Standard deviation | 1.2 | 1.1 | 1.2 | 1.0 |
Count | 461 | 103 | 256 | 102 |
% less than 10th percentile | 43% | 48% | 41% | 45% |