Yes, ERs are getting busier. But it’s not because of poor people or the uninsured, according to this analysis in the Annals of Emergency Medicine.

The study is based on national surveys conducted between 1996 and 2004. During that time, overall visits to the ER increased by 26% — but a disproportionate share of the growth came from those whose incomes put them at more than four times the poverty level, and who typically get their care at a doctor’s office. The percentage of uninsured ER patients remained flat, at roughly 15%.