Baseline socio-demographic characteristics of mothers and their LMPT and term-born infants assessed at 2 years corrected age
| Variable | Term | LMPT | p Value |
|---|---|---|---|
| Infants, n | 765 | 638 | |
| Gestational age | |||
| Mean (SD), weeks | 39.3 (1.4) | 34.9 (1.2) | – |
| 32–33 weeks, n (%) | – | 87 (13.6%) | – |
| 34–36 weeks, n (%) | – | 551 (86.4%) | – |
| 37–38 weeks, n (%) | 241 (31.5%) | – | – |
| 39–40 weeks, n (%) | 357 (46.7%) | – | – |
| 41–42 weeks, n (%) | 167 (21.8%) | – | – |
| Multiple birth | |||
| n (%) | 151 (19.7) | 107 (16.8) | – |
| Birth weight, g | |||
| Mean (SD) | 3322 (535) | 2435 (502) | – |
| Small for gestational age (SGA)* | |||
| n (%) | 48 (6.3) | 67 (10.5) | 0.004 |
| Male sex | |||
| n (%) | 384 (50.2) | 343 (53.8) | 0.18 |
| Corrected age at assessment | |||
| Mean (SD) | 24.6 (1.1) | 24.6 (1.0) | 0.41 |
| Mothers | N=690 | N=587 | p Value |
| Age | |||
| <20 years, n (%) | 16 (2.3) | 19 (3.2) | 0.56 |
| 20–24 years, n (%) | 96 (13.9) | 86 (14.7) | 0.68 |
| 25–29 years, n (%) | 181 (26.2) | 175 (29.9) | – |
| 30–34 years, n (%) | 209 (30.3) | 192 (32.8) | 0.73 |
| ≥35 years, n (%) | 188 (27.3) | 114 (19.5) | 0.003 |
| Ethnic group | |||
| White, n (%) | 569 (82.5) | 461 (78.5) | – |
| Mixed, n (%) | 7 (1.0) | 12 (2.0) | 0.118 |
| Asian or Asian British, n (%) | 77 (11.2) | 86 (14.7) | 0.057 |
| Black or Black British, n (%) | 30 (4.4) | 21 (3.6) | 0.62 |
| Chinese or other, n (%) | 7 (1.0) | 6 (1.0) | 0.92 |
| Unknown, n (%) | 0 (0.0) | 1 (0.2) | – |
| English not first language | |||
| n (%) | 85 (12.3) | 76 (13.0) | 0.66 |
| SES-Index | |||
| Low risk, n (%) | 339 (49.1) | 256 (43.6) | – |
| Medium risk, n (%) | 209 (30.3) | 184 (31.4) | 0.24 |
| High risk, n (%) | 142 (20.6) | 147 (25.0) | 0.028 |
*SGA classified as fetal weight <3rd percentile for sex and gestation using customised antenatal growth charts.28
SES-Index refers to socio-economic risk category derived from a composite measure of five indices of socio-economic risk (see the online supplementary appendix).
LMPT, late and moderately preterm.