TABLE 3.
Distribution of head circumference groups in strata defined by delivery or newborn characteristics
| Characteristics of delivery | Head circumference Z-scorea | n | ||
|---|---|---|---|---|
| <−2 | ≥−2 to <−1 | |||
| Antenatal steroid course | Complete | 10 | 25 | 903 |
| Partial | 8 | 17 | 378 | |
| None | 9 | 16 | 159 | |
| Magnesium | No | 12 | 22 | 481 |
| Tocolysis | 5 | 19 | 776 | |
| For preeclampsia | 23 | 33 | 178 | |
| Cesarean delivery | Yes | 12 | 21 | 929 |
| No | 5 | 24 | 516 | |
| Pregnancy complication | Preterm labor | 3 | 19 | 640 |
| pPROM | 8 | 26 | 305 | |
| PE | 29 | 34 | 191 | |
| Abruption | 4 | 22 | 150 | |
| Cervical insufficiency | 6 | 8 | 87 | |
| Fetal indication | 35 | 21 | 72 | |
| Duration of labor, h | 0 | 23 | 25 | 371 |
| >0 to ≤12 | 7 | 14 | 339 | |
| >12 | 4 | 24 | 735 | |
| Duration of membrane rupture, h | <1 | 11 | 21 | 850 |
| 1–24 | 7 | 17 | 235 | |
| >24–48 | 11 | 14 | 64 | |
| >48–72 | 5 | 18 | 38 | |
| >72 | 6 | 31 | 258 | |
| No. of fetuses | 1 | 10 | 25 | 978 |
| ≥2 | 8 | 16 | 467 | |
| Sex | Male | 7 | 19 | 773 |
| Female | 13 | 25 | 672 | |
| Gestational age, wk | 23–24 | 4 | 20 | 388 |
| 24–25 | 13 | 22 | 632 | |
| 27 | 10 | 23 | 425 | |
| Birthweight, g | ≤750 | 20 | 29 | 628 |
| 751–1000 | 2 | 21 | 568 | |
| >1000 | 1 | 6 | 249 | |
| Birthweight Z-scorea | <−2 | 76 | 19 | 103 |
| ≥−2 to<−1 | 20 | 55 | 202 | |
| ≥−1 | 2 | 16 | 1140 | |
| Maximum no. of infants | 138 | 317 | 1445 | |
These are row percents.
pPROM, preterm premature rupture of membranes.
a
External standard is Oxford, United Kingdom, dataset.11
McElrath. Factors associated with small head circumference at birth among ELGAN. Am J Obstet Gynecol 2010.