A new report has found that accountable care organizations (ACOs) have not statistically improved long-term spending patterns or their patients' mental health gains in recent years.

According to study authors, groups of hospitals and healthcare practices may have had reason to reduce spending and improve the quality of care for high-risk groups because of recent incentives. The only significant results from the study showed a reduction in these organizations' spending one year out from baseline, but the trend was reversed for the second year. No significant improvements were found for long-term spending efficiency or for improvements in mental health for the clients of the studied ACOs.

To read the full study abstract, visit the Health Affairs website.