Percentage multiple births (95% CI) by registration type and fathers social class: 2000
| *Based on a 10% sample of births. | |||
| Number | |||
| Couple registration births | 3.0 | (2.9, 3.0) | 558655 |
| SCI* | 3.3 | (2.8, 3.8) | 4602 |
| SCII* | 3.2 | (2.9, 3.4) | 15973 |
| SCIIIN* | 3.0 | (2.6, 3.5) | 5276 |
| Non-manual* | 3.2 | (2.9, 3.4) | 25851 |
| SCIIIM* | 2.9 | (2.7, 3.2) | 16016 |
| SCIV* | 2.4 | (2.1, 2.7) | 8375 |
| SCV* | 3.1 | (2.4, 3.7) | 2692 |
| Manual* | 2.8 | (2.6, 3.0) | 27083 |
| Other* | 2.0 | (1.5, 2.5) | 2967 |
| Sole registration births | 2.2 | (2.1, 2.3) | 45790 |
| All live births | 2.9 | (2.9, 2.9) | 604445 |