TABLE 2.
Characteristics of VLBW infants with T21, T18, T13 and triploidy in the Vermont Oxford Network born 1994–2009
| Group |
||||
|---|---|---|---|---|
| Characteristic, N (%) or Mean (SD)1 |
T21 N=1681 |
T18 N=1416 |
T13 N=435 |
Triploidy N=116 |
| Antenatal steroids | 944 (56.9) | 425 (30.2) | 166 (38.2) | 52 (45.6) |
| Female | 790 (47.0) | 806 (57.0) | 240 (55.3) | 67 (58.3) |
| Multiple births | 285 (17.0) | 140 (9.9) | 33 (7.6) | 1 (0.86) |
| Race | ||||
| Black | 227 (13.6) | 232 (16.5) | 82 (18.9) | 12 (10.3) |
| Hispanic | 341 (20.4) | 305 (21.6) | 109 (25.2) | 13 (11.2) |
| White | 972 (58.0) | 726 (51.5) | 218 (50.3) | 87 (75.0) |
| Asian2 | 80 (5.0) | 93 (7.0) | 12 (2.9) | 3 (2.8) |
| Native American2 | 13 (0.82) | 17 (1.3) | 3 (0.73) | 1 (0.93) |
| Other | 42 (2.5) | 37 (2.6) | 9 (2.1) | 0 (0.0) |
| Small for gestational age | 769 (45.8) | 1128 (79.7) | 201 (46.2) | 68 (58.6) |
| Apgar-1min ≤3 | 383 (23.0) | 878 (62.9) | 264 (61.5) | 67 (58.3) |
| Apgar-5min ≤3 | 206 (12.3) | 451 (32.5) | 160 (37.3) | 44 (38.3) |
| Inborn | 1368 (81.4) | 1157 (81.7) | 376 (86.4) | 100 (86.2) |
| Birth weight (grams) | ||||
| Mean (SD) | 1070 (316) | 1102 (287) | 1088 (316) | 889 (295) |
| Range | 401–1500 | 405–1500 | 401–1500 | 410–1440 |
| 401–500 | 102 (6.1) | 39 (2.7) | 25 (5.7) | 12 (10.3) |
| 501–600 | 100 (6.0) | 59 (4.2) | 25 (5.7) | 14 (12.1) |
| 601–700 | 98 (5.8) | 62 (4.4) | 21 (4.8) | 14 (12.1) |
| 701–800 | 91 (5.4) | 84 (5.9) | 25 (5.7) | 9 (7.8) |
| 801–900 | 106 (6.3) | 116 (8.2) | 22 (5.1) | 8 (6.9) |
| 901–1000 | 129 (7.7) | 130 (9.2) | 39 (9.0) | 14 (12.1) |
| 1001–1100 | 159 (9.5) | 158 (11.2) | 35 (8.1) | 16 (13.8) |
| 1101–1200 | 171 (10.2) | 146 (10.3) | 47 (10.8) | 6 (5.2) |
| 1201–1300 | 216 (12.8) | 170 (12.0) | 53 (12.2) | 14 (12.1) |
| 1301–1400 | 242 (14.4) | 207 (14.6) | 59 (13.6) | 5 (4.3) |
| 1401–1500 | 267 (15.9) | 245 (17.3) | 84 (19.3) | 4 (3.4) |
| Gestational age (weeks) | ||||
| Mean (SD) | 29.4 (3.8) | 31.8 (3.6) | 29.6 (3.4) | 29.6 (3.9) |
| Range | 19–40 | 17–41 | 21–37 | 18–38 |
| 15–23 | 163 (9.7) | 33 (2.3) | 37 (8.5) | 8 (6.9) |
| 24–26 | 187 (11.1) | 88 (6.2) | 39 (9.0) | 15 (12.9) |
| 27–29 | 430 (25.6) | 226 (16.0) | 111 (25.5) | 28 (24.1) |
| 30–32 | 548 (32.6) | 409 (28.9) | 171 (39.3) | 40 (34.5) |
| 33–41 | 351 (20.9) | 659 (46.6) | 77 (17.7) | 25 (21.6) |
1
SD= standard deviation. Information was missing in the groups shown for mode of delivery: 2 infants; antenatal steroids: 32; sex: 4; race: 14; SGA: 4; GA: 3; Apgar-1 min: 39; Apgar-5 min: 44.
2
Variable added in 1997, thus the denominator excludes infants born prior to 1997. Prior to 1997, Asian race and Native American race coded in Other race category.