Table 3 Percentage of singleton births at 23–41 weeks of gestation based on obstetric estimates (OE) for the six categories of intrauterine growth stage for the 4,917,260 such singleton births in California from 2007 to 2016, with the percentage of LBW infants in parenthesis
Category | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 |
|---|---|---|---|---|---|---|---|---|---|---|
Preterm-SGA | 0.4 (100) | 0.4 (100) | 0.4 (100) | 0.5 (100) | 0.4 (100) | 0.4 (100) | 0.4 (100) | 0.4 (100) | 0.4 (100) | 0.5 (100) |
Preterm-AGA | 5.8 (47.9) | 5.8 (47.4) | 5.6 (48.8) | 5.5 (49.5) | 5.5 (49.9) | 5.5 (49.6) | 5.4 (50.7) | 5.3 (49.9) | 5.5 (50.6) | 5.6 (49.9) |
Preterm-LGA | 1.2 (17.0) | 1.1 (17.3) | 1.0 (17.6) | 1.0 (19.5) | 0.9 (19.6) | 0.9 (20.3) | 0.9 (21.7) | 0.9 (19.9) | 0.9 (20.4) | 0.9 (19.7) |
Term-SGA | 4.9 (29.4) | 4.8 (29.0) | 5.0 (28.7) | 5.0 (29.0) | 5.0 (28.2) | 4.9 (28.2) | 5.0 (28.2) | 5.0 (27.7) | 5.0 (28.0) | 4.9 (27.9) |
Term-AGA | 81.1 (0.4) | 81.2 (0.4) | 81.6 (0.4) | 81.8 (0.4) | 82.0 (0.5) | 82.0 (0.5) | 82.2 (0.5) | 82.3 (0.5) | 82.3 (0.5) | 82.0 (0.5) |
Term-LGA | 6.7 (0.0) | 6.6 (0.0) | 6.4 (0.0) | 6.3 (0.0) | 6.3 (0.0) | 6.3 (0.0) | 6.1 (0.0) | 6.1 (0.0) | 5.9 (0.0) | 6.1 (0.0) |
Preterm-SGA + Term-SGA | 5.3 (35.2) | 5.3 (34.7) | 5.4 (34.3) | 5.5 (34.8) | 5.4 (34.0) | 5.3 (34.1) | 5.4 (33.9) | 5.5 (33.4) | 5.4 (33.9) | 5.4 (33.9) |