Comparisons made between BBA data and overall data for the South West
| Characteristic | BBA data Number (%) | Overall south west data Number (%) |
| Safeguarding concerns documented at booking | n=217 | n=48 900 |
| Yes | 47 (22) | 4180 (8) |
| No | 170 (78) | 43 425 (89) |
| Missing data | 0 (0) | 1295 (3) |
| Previous live birth(s) | n=217 | n=48 905 |
| Yes | 185 (85) | 26 875 (55) |
| No | 32 (15) | 19 125 (39) |
| Missing data | 0 (0) | 2905 (6) |
| Gestation at booking* | n=217 | n=48 900 |
| Early booker (up to 12+6 weeks) | 179 (83) | 46 020 (94) |
| Delayed booker (13 to 19+6 weeks) | 20 (9) | 1835 (4) |
| Late booker/not booked (≥20 weeks) | 14 (6) | 935 (2) |
| Missing data | 4 (2) | 110 (0.2) |
| Mother’s age at booking | n=217 | n=48 900 |
| Under 20 | 7 (3) | 1410 (3) |
| 20–29 | 90 (41) | 20 000 (41) |
| 30–39 | 108 (50) | 25 725 (53) |
| 40 or over | 11 (5) | 1765 (4) |
| Missing data | 1 (0.1) | 0 (0) |
*Booking classifications are presented as defined by the National Institute for Health and Care Excellence.30
BBA, birth before arrival.