For-profit hospitals are associated with higher death rates and significantly worse nurse staffing than their nonprofit counterparts, according to a major new study from Penn Nursing published in the journal Medical Care. The research examined 1.17 million Medicare admissions and found roughly 11 more deaths per 1,000 medical admissions at for-profit facilities, alongside higher readmission rates.

The staffing gap was stark. Seventy-one percent of nurses at for-profit hospitals rated their staffing levels as unsafe, compared with 54 percent at nonprofit hospitals — and the researchers linked much of the outcome gap to those staffing differences. It is the latest evidence that who owns a hospital can shape what happens inside it.

The findings land amid an intensifying debate over the corporatization of American healthcare, where private-equity acquisitions and for-profit chains have expanded rapidly. Critics argue that the profit motive squeezes labour costs — nurses first — while defenders say ownership structure is a poor proxy for quality and that many for-profits serve communities other systems avoid.

For patients and policymakers, the study adds quantitative weight to a qualitative complaint heard for years on hospital floors. With nurse-to-patient ratios now a live legislative issue in several states, expect these numbers to surface in the next round of the staffing-mandate debate.