Table 1.
Maternal characteristics of 592 women with singleton pregnancy and reduced symphysis–fundus height at booking, according to subsequent birth‐weight (BW) centile of infant
| Characteristic | SGA < 3rd centile (n = 78) | SGA < 10th centile (n = 192) | BW ≥ 10th centile (n = 400) | All women (n = 592) |
|---|---|---|---|---|
| Maternal age (years) | 29.1 (24.1–32.9) | 29.6 (24.8–33.5) | 30.0 (25.3–33.7) | 29.9 (25.2–33.6) |
| BMI (kg/m2) | 22.9 (20.3–25.2) | 21.7 (20.1–24.1) | 21.5 (20.0–23.4) | 21.5 (20.0–23.6) |
| White ethnicity | 52 (66.7) | 122 (63.5) | 266 (66.5) | 388 (65.5) |
| Nulliparous | 65 (83.3) | 163 (84.9) | 344 (86.0) | 507 (85.6) |
| Highest first‐trimester systolic BP (mmHg) | 105 (100–114) | 105 (100–114) | 104 (100–112) | 105 (100–112) |
| Highest first‐trimester diastolic BP (mmHg) | 63 (60–70) | 62 (60–70) | 60 (60–69) | 61 (60–70) |
| Smoking status | ||||
| Never smoked | 46 (59.0) | 128 (66.7) | 306 (76.5) | 434 (73.3) |
| Quit smoking before pregnancy | 9 (11.5) | 22 (11.5) | 31 (7.8) | 53 (8.9) |
| Quit smoking during pregnancy | 10 (12.8) | 16 (8.3) | 24 (6.0) | 40 (6.7) |
| Current smoker | 13 (16.7) | 26 (13.5) | 39 (9.8) | 65 (11.0) |
| Drug use | ||||
| History of drug use* | 5 (6.4) | 6 (3.1) | 3 (0.8) | 9 (1.5) |
| Current drug user† | 1 (1.3) | 2 (1.0) | 0 (0) | 2 (0.3) |
| Medical history | ||||
| PE requiring delivery at < 34 weeks | 0 (0) | 0 (0) | 1 (0.3) | 1 (0.2) |
| Chronic hypertension | 0 (0) | 1 (0.5) | 1 (0.3) | 2 (0.3) |
| SLE/APS | 1 (1.3) | 1 (0.5) | 0 (0) | 1 (0.2) |
| Pre‐existing diabetes mellitus | 0 (0) | 0 (0) | 1 (0.3) | 1 (0.2) |
| Renal disease | 0 (0) | 0 (0) | 0 (0) | 0 (0) |
| Self‐report of previous small baby | 9 (11.5) | 22 (11.5) | 27 (6.8) | 49 (8.3) |
Data are given as median (interquartile range) or n (%).
*
Including cannabis, cocaine, ecstasy, amphetamines (speed and/or crystal meth) and heroin.
†
Cannabis only (rare or occasional use). APS, antiphospholipid syndrome; BMI, body mass index; BP, blood pressure; PE, pre‐eclampsia; SGA, small‐for‐gestational age; SLE, systemic lupus erythematosus.