Study objective-The aim was to study the pattern and magnitude of regional differences in psychiatric morbidity and compare these with regional differences in all cause mortality.Design-The study was a secondary analysis of data from a cross sectional survey. The main outcome was the prevalence of psychiatric morbidity. This was assessed using the general health questionnaire, a self administered measure of neurotic symptoms.Setting-England, Wales and Scotland. Participants-9003 adults were selected from the electoral register.Main results-The prevalence of psychiatric morbidity was 31% with a statistically significant difference between the regions (p = 0006). All four northern regions of England had a higher prevalence of psychiatric morbidity than the four southern regions. These differences were comparable in size to the regional differences in all cause mortality. Scotland had low psychiatric morbidity but high all cause mortality while Greater London had high psychiatric morbidity but low mortality. Regional variation in psychiatric morbidity was less marked within social classes I The present study was designed to examine the prevalence of psychiatric morbidity measured using the GHQ, and to study differences in mental health between the British regions. The results were then compared with regional all cause mortality. Finally, explanatory factors for the regional differences in the prevalence of psychiatric morbidity were explored.
MethodsThe study used data collected in the health and lifestyle survey between 1984 and July 1985, and details of the method have already been described.'8 The study population was selected using a three stage design. Within standard regions of England, Wales, and Scotland parliamentary constituencies were allocated to one of three population density bands, and 198 constituencies were then selected with probability proportional to the size of the electorate. Two wards were selected from each, again with probability proportional to the electorate. In each household one individual aged 18 years or over was selected from all those resident, using random numbers. A total of 12 254 addressess provided interviews with 9003 individuals.Information was collected at two home visits and on the second visit the respondents were given the 30 item GHQ and asked to complete and return it to the survey organisation.