Characteristics of 101 surviving children assessed at 2 years corrected age: total cohort, cohort I and II, and AGA and SGA infants
| By cohort | By gestational age | ||||||
|---|---|---|---|---|---|---|---|
| Total cohort (n=101), n (%) | Cohort I (n=45), n (%) | Cohort II (n=56), n (%) | Cohort I vs II, p value | AGA (n=45), n (%) | SGA (n=56), n (%) | AGA vs SGA, p value | |
| Median maternal age (years) (min–max) | 30.0 (17–45) | 29.0 (19–43) | 31.0 (17–45) | 0.198 | 29.0 (19–43) | 31.0 (17–45) | 0.173 |
| Median birth weight (g) (min–max) | 675 (480–750) | 649 (480–750) | 685 (540–750) | 0.025 | 720 (580–750) | 635 (480–750) | <0.001 |
| Median gestational age (weeks) (min-max) | 28.00 (24.84–34.42) | 27.84 (24.84–34.42) | 28.21 (25.0–34.14) | 0.205 | 26.70 (24.84–29.42) | 28.84 (26.28–34.42) | <0.001 |
| Multiple birth | 20 (19.8) | 8 (17.8) | 12 (21.4) | 0.803 | 13 (28.9) | 7 (12.5) | 0.048 |
| Male | 45 (44.6) | 20 (44.4) | 25 (44.6) | 1.000 | 15 (33.3) | 30 (53.6) | 0.047 |
| Ethnicity (Caucasian) | 93 (92.1) | 43 (95.6) | 50 (89.3) | 0.293 | 40 (88.9) | 53 (94.6) | 0.461 |
| Socio-economic status | 0.515 | 0.429 | |||||
| High | 21 (21.0) | 7 (15.6) | 14 (25.5) | 9 (20.5) | 6 (10.7) | ||
| Average | 64 (64.0) | 31 (68.9) | 33 (60.0) | 26 (59.1) | 38 (67.9) | ||
| Low | 15 (15.0) | 7 (15.6) | 8 (14.5) | 9 (20.5) | 12 (21.4) | ||
| Maternal educational level | 0.019 | 0.308 | |||||
| High | 12 (17.9) | 1 (3.3) | 11 (29.7) | 5 (15.6) | 7 (20.0) | ||
| Average | 28 (41.8) | 14 (46.7) | 14 (37.8) | 11 (34.4) | 17 (48.6) | ||
| Low | 27 (40.3) | 15 (50.0) | 12 (32.4) | 16 (50.0) | 11 (31.4) | ||
| Prenatal steroids (GA <32 weeks) | 81 (86.2) | 34 (82.9) | 47 (88.7) | 0.549 | 39 (86.7) | 42 (85.7) | 1.000 |
| Caesarean delivery | 83 (82.2) | 36 (80.0) | 47 (83.9) | 0.794 | 27 (60.0) | 56 (100) | <0.001 |
| 5 Min Apgar score <7 | 12 (11.9) | 6 (13.3) | 6 (10.7) | 0.762 | 8 (17.8) | 4 (7.1) | 0.127 |
| SGA | 56 (55.4) | 22 (48.9) | 34 (60.7) | 0.314 | – | – | – |
Total cohort: infants born in 1996–2005; cohort I: 1996–2000; cohort II: 2001–2005. Maternal educational level was available in 87.1% of infants.
AGA, appropriate for gestational age, ≥p10; GA, gestational age; SGA, small for gestational age, <p10.