However, the common hierarchical model of workplaces can mean that while a simple test of proportionality suggests equality of employment opportunity may have been achieved or is within touching distance, data is lacking by which to cross-check if equality is being delivered vertically in the workplace as well as horizontally.
Research from 2017 into the employment of Black Minority Ethnic people in the NHS in Scotland revealed that 2.44% of the workforce identified as BME. In simple, proportionate, terms, this can be deemed too low and evidence of discrimination along the horizontal axis of workforce data.