Table 1.
Selected characteristics of SGA and non-SGA births, National Birth Defects Prevention Study, 1997-2011. Values are n (%).
| Characteristic | SGA (n=1,045) |
Non-SGA (n=10,019) |
P-value |
|---|---|---|---|
| Maternal Age Group | 0.029 | ||
| <20 years | 117 (11.2) | 977 (9.8) | |
| 20-34 years | 764 (73.1) | 7,693 (76.8) | |
| ≥35 years | 164 (15.7) | 1,349 (13.5) | |
| Race/Ethnicity | <0.001 | ||
| Non-Hispanic White | 575 (55.0) | 5,847 (58.4) | |
| Non-Hispanic Black | 83 (7.9) | 1,114 (11.1) | |
| Hispanic | 297 (28.4) | 2,433 (24.3) | |
| Other | 90 (8.6) | 625 (6.2) | |
| Parity | 0.141 | ||
| 0 | 396 (37.9) | 3,954 (39.5) | |
| 1 | 370 (35.4) | 3,246 (32.4) | |
| ≥2 | 279 (26.7) | 2,819 (28.1) | |
| Annual Household Income | <0.001 | ||
| <$10,000 | 229 (23.9) | 1,681 (18.3) | |
| $10,000-$50,000 | 445 (46.4) | 4,113 (44.8) | |
| >$50,000 | 285 (29.7) | 3,390 (36.9) | |
| Maternal Education | <0.001 | ||
| < High school | 218 (21.1) | 1,587 (16.0) | |
| High school | 277 (26.8) | 2,333 (23.6) | |
| Some college | 276 (26.7) | 2,673 (27.0) | |
| College degree | 261 (25.3) | 3,308 (33.4) | |
| Prepregnancy BMI | <0.001 | ||
| Underweight | 90 (9.1) | 478 (5.0) | |
| Normal | 576 (58.0) | 5,139 (53.4) | |
| Overweight | 194 (19.5) | 2,212 (23.0) | |
| Obese | 134 (13.5) | 1,792 (18.6) | |
| Gestational Diabetes | 47 (4.6) | 448 (4.6) | 0.973 |
| Late Pregnancy Smoking | 149 (14.4) | 818 (8.2) | <0.001 |
| First Trimester Alcohol Use | 352 (34.2) | 3,731 (37.7) | 0.031 |
| First Trimester Folic Acid Supplement Use | 853 (90.0) | 8,630 (93.0) | <0.001 |