Higher minimum wage: linked to less distress. Bodies: no clear change.

Observational study. 699 people. 1999-2019 data (11 survey rounds, 2-yearly after 1997); participants followed on average 4.8 survey rounds, about 9.6 years.

The scientists only watched the habit. Nobody was told what to do. A clue, not proof.

Who: Low-wage-earning US adults in the Panel Study of Income Dynamics (PSID): they or their partner earned an hourly wage <=150% of their state's minimum wage, household income <=200% of the poverty line, and eligible at least once before and once after 2009. Mean age 29 in 1999, 73% female, 50% Black, 18% Hispanic, 38% married. 1472 observations in 20 exposed states, 1854 in 24 comparator states

• Distress score-1 pton a 0-24 scale
• Weight (BMI)noneno clear change
• Self-rated healthnoneno clear change

More to know, from our read of the paper:

• Psychological distress (Kessler K-6, 0-24, past 30 days) is self-reported, and was only collected for the primary respondent of each household and only from 2001 (2455 observations). BMI comes from self-reported height and weight
• The distress result is fragile: still negative but no longer statistically significant when the window is limited to 2003-2013 (DiD -0.711, p<0.10, 1666 observations) or when the sample includes incomes up to 300% of poverty (DiD -0.562, p<0.10). The authors read this as the benefit building up over time; say 'smaller and less certain in a shorter window'
• Size: about 1 point on a 0-24 scale. Do not convert into a percentage. Baseline mean distress was 4.53 in exposed vs 3.61 in comparator states
• Exposed and comparator groups differed a lot (exposed: 75% vs 30% Black, 6% vs 26% Hispanic, 25% vs 48% married); fixed effects and covariates adjust for this, and pre-trend checks were mostly fine (exposed group had higher BMI in 1999)
• Sample oversamples Black households (50% vs 14% of US minimum-wage earners in 2009); no sampling weights; results not generalisable to all US adults. City-level minimum wages could not be accounted for

Researchers used US panel data from 1999 to 2019 on 699 low-wage adults, followed for about 9.6 years on average. Those in 20 states that relied on the federal minimum wage, which rose to $7.25 an hour by 2009, were compared with low-wage workers in 24 states that already had a higher minimum. In the fully adjusted model, self-reported psychological distress fell by about 1 point on a 0-24 scale; weight (BMI), self-rated health and chronic conditions showed no clear change. In a shorter 2003-2013 window the distress drop was smaller and not statistically clear. A natural experiment in observational data: linked, not proven.

We read the abstract and the full text of this paper and checked every number on this page against it (17 facts, checked on 2026-10-29). The study design is named above. Cohort and other observational studies are described as linked, not proven. Found an error? Email theis@onestudyaday.com.