Maternal and infant characteristics of the Southampton Women's Survey study group
| With BP measurement (n=761) | Without BP measurement (n=879) | |||
|---|---|---|---|---|
| Mean | SD | Mean | SD | |
| Mothers | ||||
| Maternal age at birth of the child*** | 29.7 | 3.7 | 30.6 | 3.8 |
| Pre-pregnancy weight (kg) | 67.3 | 13.9 | 68.3 | 13.9 |
| Height (cm) | 163.0 | 6.5 | 163.4 | 6.3 |
| Maternal BMI (pre-pregnancy; kg/m2) | 25.3 | 4.8 | 25.5 | 4.8 |
| Per cent | Per cent | |||
| Smoking in pregnancy* | 16.2 | 12.2 | ||
| Social class | ||||
| Professional/Management and technical (I/II) | 39.2 | 43.0 | ||
| Skilled manual/non-manual (III) | 48.4 | 46.5 | ||
| Partly skilled/unskilled (IV/V) | 12.4 | 10.6 | ||
| Educational attainment* | ||||
| Compulsory education to age 16 years | 44.9 | 39.0 | ||
| Postcompulsory education | 55.1 | 61.0 | ||
| Infants | ||||
| Gender—male, n (%) | 397 (52.2) | 473 (53.8) | ||
| Age in years at 36 months visit*** | 3.09 | 0.10 | 3.07 | 0.09 |
| Weight (kg) at 36 months visit | 15.0 | 1.9 | 15.1 | 1.8 |
| Height (cm) at 36 months visit | 95.7 | 3.7 | 96.0 | 3.6 |
| Abdominal circumference (cm) at 36 months visit | 51.2 | 3.2 | 51.3 | 3.1 |
| Subscapular skinfold (mm) at 36 months visit | 6.63 | 1.85 | 6.49 | 1.76 |
| Systolic BP (mm Hg) at 36 months visit | 93.8 | 8.3 | ||
| Diastolic BP (mm Hg) at 36 months visit | 58.1 | 6.3 | ||
| Birth weight (kg)** | 3.42 | 0.57 | 3.50 | 0.52 |
| Birth length (cm)* | 49.8 | 2.1 | 50.0 | 2.0 |
*p<0.05, **p<0.01, ***p<0.001.
BMI, body mass index; BP, blood pressure.