Depression Mediates Association Between Perceived Ethnic Discrimination and Elevated Blood Glucose Levels Among Sub-Saharan African Migrants in Australia.

Abstract

Depression and perceived ethnic discrimination (PED) are both implicated in type 2 diabetes mellitus (T2DM) risk in some migrant populations. The role of these factors remains understudied in sub-Saharan African migrants, who comprise a significant at-risk group for T2DM in Australia. To assess interactions between PED, depression scores and elevated blood glucose levels among sub-Sahara African immigrants in North-Eastern Australia. Face to face surveys were used to assess PED and depressive tendencies in a purposive sample of 170 adults (aged ≥18year). Fasting blood glucose levels (FBGL) were measured at the time of interviews. Prevalence of elevated FBGL (≥6.1mmol/L), PED and severe depression (SD) were: 17.6% (n = 30), 14.7% (n = 25) and 18.8% (n = 32), respectively. Prevalence of elevated FBGL, PED and SD were all higher in males than females. The highest prevalence of elevated BGL, PED and SD each occurred in the 40-50year age group. Strong positive correlations of both high level PED and SD with elevated FBGL were observed. There was also a strong positive association between PED and SD. Depression score was found to mediate partially the strong association between PED and elevated FBGL (β-value for PED dropped from β = 0.452 to β = 0.246, p < 0.01 and the associated between FBGL and SD remained strong β = 0.554, p < 0.01). The strong association between elevated FBGL and PED seems to be moderated by SD, indicating that interventions to attenuate depression and PED may be a useful adjunct to diabetes prevention programs in this population. Interventions targeted to specific age groups may also be warranted.