Alternative ways of measuring neighbourhood ethnic density Mai Stafford & Laia Becares Dept Epidemiology & Public Health, UCL James Nazroo CCSR & School.

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Presentation transcript:

Alternative ways of measuring neighbourhood ethnic density Mai Stafford & Laia Becares Dept Epidemiology & Public Health, UCL James Nazroo CCSR & School of Social Sciences, University of Manchester

Background Evidence that higher proportion of co-ethnics in neighbourhood is associated with reduced risk of morbidity among ethnic minorities “Ethnic density” effect Plausible explanations (social support, racial discrimination, behavioural norms) How should we measure neighbourhood ethnic density?

Social support –shared culture, empathy, beliefs Racial discrimination –interpersonal (conflict/concord between ethnic groups) –institutional (power, status) Norms of health-related behaviour –customs, religious code Explanatory pathways

Objective measures of ED 2001 Census: England and Wales WhiteBlack or Black British BritishCaribbean IrishAfrican Any other White backgroundAny other Black background MixedChinese or other ethnic group White and Black CaribbeanChinese White and Black AfricanAny other ethnic group White and AsianNot stated Any other Mixed background Asian or Asian British Indian Pakistani Bangladeshi Any other Asian background % in MSOA not white Captures ? % Indian

Subjective measures of ED Citizenship Survey (2005) Clustered in small areas due to sampling strategy “… thinking about people in this local area (15/20 mins walking distance), what proportion … are of the same ethnic group as you?’’ “All the same / more than half / about half / less than half”

Description of CS 2005 sample

Age distribution of CS 2005 sample

Subjective ED

Objective ED Cut-offs are Whites: 75%, 90%, 95%, 97.5%; Indians, Pakistanis and Bangladeshis: 1%, 10%, 20%, 40%; Caribbeans and Africans: 0.5%, 5%, 10%, 20%

Objective versus subjective ED

Modelling ED and illness What is relationship between ED and limiting long-term illness? Regression model with robust standard errors to allow for hierarchy of ppts in small areas Control for gender, age, SES and area deprivation as important correlates of limiting illness

Subjective ED and limiting illness Adjusted for age, gender, occupation-based socioeconomic group and area deprivation.

Objective ED and limiting illness Cut-offs are Whites: 75%, 90%, 95%, 97.5%; Indians, Pakistanis and Bangladeshis: 1%, 10%, 20%, 40%; Caribbeans and Africans: 0.5%, 5%, 10%, 20%. Adjusted for age, gender, occupation-based socioeconomic group and area deprivation.

Summary There is positive correlation between objective and subjective indicators of ED White ppts tended to underestimate % whites in MSOA Participants from all other ethnic groups tended to overestimate % in their own ethnic group Subjective ED was associated with long-term limiting illness (controlling for age, SES etc) Subjective ED was more strongly associated with long- term limiting illness than was objective ED and associations were more consistent across ethnic groups Real difference in association between ED and illness for Caribbean people?

Discussion What explains failure to find association between objective ED and limiting illness? –Consider other health outcomes Reasonably consistent evidence for protective association between objective ED and psychoses, anxiety/depression, suicide & self harm Less consistent for physical health outcomes –Insufficient range of ED Compare US where black density reaches much higher levels –BUT subjective ED was associated with illness in this study so above do not appear good explanations

Why might objective ED be less relevant than subjective ED for health? –MSOA may not be an appropriate geographical unit to summarise ED Subjective ED based on participant’s own definition of their area This may capture people’s movements and exposure more accurately –Ethnicity based on pre-defined categories in questionnaire Assumes level of agreement between people in an area as to ethnic identification Subjective ED based on participant’s categorisation of the people around them –Consider other health outcomes Reasonably consistent evidence for protective association between objective ED and psychoses, anxiety/depression, suicide & self harm Less consistent for physical health

Study highlights difficulties in capturing the social and cultural aspects of ethnic identity using pre-defined categories & collective social phenomena using data aggregated to administrative areas Concluding remarks Future studies may consider including subjective measures of ED

Thank you for listening! Mai Stafford Am J Epidemiol. 2009;170(4):