Controlling for socioeconomic disadvantage in epidemiologic analyses

Area of Science:

• Epidemiology
• Public Health
• Sociology

Background:

• Socioeconomic status (SES) is a key factor in health research.
• The Elley Irving scale is widely used in New Zealand to assess SES.
• Previous research indicates potential ethnic disparities in SES indicators.

Purpose of the Study:

• To evaluate the Elley Irving scale's effectiveness in capturing socioeconomic disadvantage across ethnic groups in New Zealand.
• To examine ethnic variations in material well-being indicators within defined SES strata.

Main Methods:

• Utilized data from the control group of a large, population-based case-control study.
• Analyzed indicators of socioeconomic disadvantage, including car access and owner occupation.
• Compared these indicators between Maori/Pacific Island and non-Maori/Pacific Island ethnic groups within socioeconomic strata defined by the Elley Irving scale.

Main Results:

• Maori/Pacific Island individuals had significantly lower car access across most socioeconomic strata.
• Owner occupation was also significantly lower in the Maori/Pacific Island group, except in the highest SES stratum.
• These findings highlight ethnic inequalities in material well-being not fully captured by the Elley Irving scale.

Conclusions:

• The Elley Irving scale demonstrates limited utility in accurately reflecting material well-being across diverse ethnic groups.
• Its widespread application in epidemiologic studies to control for socioeconomic disadvantage warrants critical re-evaluation.
• Further research is needed to develop more equitable measures of socioeconomic status in diverse populations.