Table 4.
Trends in infant mortality rates (95% confidence interval) for couple registrations by father’s social class, England and Wales, 1975 to 1996
| Year | Class I-II | Class IV-V | Excess mortality classes IV-V over I-II (%) |
|---|---|---|---|
| Perinatal mortality/1000 total births | |||
| 1975-7 | 13.8 (13.4 to 14.1) | 20.6 (20.1 to 21.0) | 50 |
| 1982-4 | 8.2 (8.0 to 8.5) | 12.4 (12.1 to 12.8) | 51 |
| 1989-91 | 6.5 (6.3 to 6.7) | 9.5 (9.2 to 9.8) | 47 |
| 1994-6 | 7.2 (7.0 to 7.4) | 10.2 (9.9 to 10.5) | 41 |
| Neonatal mortality/1000 live births | |||
| 1975-7 | 7.6 (7.4 to 7.9) | 11.3 (11.0 to 11.7) | 48 |
| 1982-4 | 4.7 (4.5 to 4.8) | 7.0 (6.7 to 7.3) | 50 |
| 1989-91 | 3.7 (3.6 to 3.9) | 5.2 (5.0 to 5.5) | 40 |
| 1994-6 | 3.4 (3.2 to 3.5) | 4.8 (4.6 to 5.0) | 42 |
| Postneonatal mortality/1000 live births | |||
| 1975-7 | 3.0 (2.8 to 3.2) | 6.1 (5.9 to 6.4) | 105 |
| 1982-4 | 2.9 (2.8 to 3.1) | 5.2 (5.0 to 5.4) | 78 |
| 1989-91 | 2.0 (1.9 to 2.1) | 4.3 (4.1 to 4.6) | 118 |
| 1994-6 | 1.3 (1.2 to 1.4) | 2.2 (2.1 to 2.4) | 78 |
| Overall infant mortality/1000 live births | |||
| 1975-7 | 10.6 (10.3 to 10.9) | 17.5 (17.0 to 17.9) | 64 |
| 1982-4 | 7.6 (7.3 to 7.8) | 12.2 (11.8 to 12.5) | 61 |
| 1989-91 | 5.7 (5.5 to 5.9) | 9.6 (9.3 to 9.9) | 67 |
| 1994-6 | 4.6 (4.4 to 4.8) | 7.0 (6.8 to 7.3) | 52 |