Postneonatal mortality in the Nottingham Health District 1985-1988

Studies carried out in 1978 and 1981 found postneonatal mortality to be associated with poor environmental conditions. Since then, many changes have occurred to the environment. This study was designed to discover which factors are now associated with a higher risk of postneonatal death. A retrospective case-control study was carried out using 107 cases and 422 controls matched only for date of birth, to look at the effect of area of residence, social class, mother's age, and sex, birthweight, legitimacy and number of siblings. Fifty-eight per cent of the deaths were due to the sudden infant death syndrome, making this the leading cause of death. Causes previously absent from the death certificates are now appearing, particularly prematurity related deaths which now account for almost 6 per cent. The deaths were found to occur more frequently at home, in the winter, and at a peak age of 2 to 4 months. As shown previously in Nottingham, the deaths were more likely to have been male (relative risk 2.03), illegitimate (2.91), and of low birthweight (28.8). Total mortality was significantly higher in babies of mothers aged 19 or less and in babies of manual workers. Surprisingly, babies born to unemployed parents were found to have a very low relative risk of death (0.26). Mortality is still higher in the city than the suburbs and in areas of deprivation. Although still a risk factor for SIDS, high parity of the mother was found to be non-significant for postneonatal mortality in total.(ABSTRACT TRUNCATED AT 250 WORDS)