Objective:
This study presents results of a midpoint analysis of an ongoing natural experiment evaluating the diet-related effects of the Minneapolis Minimum Wage Ordinance, which incrementally increases the minimum wage to $15/hr.
Design:
A difference-in-difference (DiD) analysis of measures collected among low-wage workers in two U.S. cities (one city with a wage increase policy and one comparison city). Measures included employment-related variables (hourly wage, hours worked, and non-employment assessed by survey questions with wages verified by paystubs), body mass index measured by study scales and stadiometers, and diet-related mediators (food insecurity, Supplemental Nutrition Assistance Program (SNAP) participation, and daily servings of fruits and vegetables, whole-grain rich foods, and foods high in added sugars measured by survey questions).
Setting:
Minneapolis, Minnesota and Raleigh, North Carolina
Participants:
A cohort of 580 low-wage workers (268 in Minneapolis, 312 in Raleigh) who completed three annual study visits between 2018 and 2020.
Results:
In DiD models adjusted for time-varying and non-time-varying confounders, there were no statistically significant differences in variables of interest in Minneapolis compared with Raleigh. Trends across both cities were evident, showing a steady increase in hourly wage, stable body mass index, an overall decrease in food insecurity, and non-linear trends in employment, hours worked, SNAP participation, and dietary outcomes.
Conclusion:
There was no evidence of a beneficial or adverse effect of the Minimum Wage Ordinance on health-related variables during a period of economic and social change. The COVID-19 pandemic and other contextual factors likely contributed to the observed trends in both cities.