BMJ 1999;319:1031-1034 ( 16 October )

Papers

Ecological analysis of ethnic differences in relation between tuberculosis and poverty

Jeremy I Hawker, consultant epidemiologist, a Surinder S Bakhshi, consultant in communicable disease control, b Shaukat Ali, research associate, b C Paddy Farrington, senior statistician. c

a Public Health Laboratory Service Communicable Disease Surveillance Centre (West Midlands), Birmingham Heartlands Hospital, Bordesley Green East, Birmingham B9 5SS, b Birmingham Health Authority, St Chads Court, Birmingham B16 9RG, c Department of Statistics, Open University, Walton Hall, Milton Keynes MK7 6AA

Correspondence to: J I Hawker jhawker{at}cdscwmid.demon.co.uk

Objective: To examine the effect of ethnicity on the relation between tuberculosis and deprivation.
Design: Retrospective ecological study comparing incidence of tuberculosis in white and south Asian residents of the 39 electoral wards in Birmingham with ethnic specific indices of deprivation.
Setting: Birmingham, 1989-93.
Subjects: 1516 notified cases of tuberculosis.
Main outcome measures: Rates of tuberculosis and measures of deprivation.
Results: Univariate analysis showed significant associations of tuberculosis rates for the whole population with several indices of deprivation (P<0.01) and with the proportion of the population of south Asian origin (P<0.01). All deprivation covariates were positively associated with each other but on multiple regression, higher level of overcrowding was independently associated with tuberculosis rates. For the white population, overcrowding was associated with tuberculosis rates independently of other variables (P=0.0036). No relation with deprivation was found for the south Asian population in either single or multivariable analyses.
Conclusions: Poverty is significantly associated with tuberculosis in the white population, but no such relation exists for those of Asian ethnicity. These findings suggest that causal factors, and therefore potential interventions, will also differ by ethnic group.


Key messages

  • Previous studies in the United Kingdom have been unable to disentangle the effects of poverty and ethnicity on the incidence of tuberculosis

  • A strong relation was found between measures of poverty and tuberculosis in the white population

  • No relation between measures of poverty and tuberculosis was found in the Asian population

  • The only measure of poverty independently associated with tuberculosis in the white population is overcrowding

  • An increasing proportion of tuberculosis is occurring in Asian people and causal factors in this group are likely to be different from those in the white population




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Relevant Article

Poverty does not predict tuberculosis in Asians in UK
BMJ 1999 319: 0. [Full Text]

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