While non-Hispanic white patients had the highest overall rate increase by ethnicity, rising from 5.6 to 10.5 per 100,000 population, rates in non-Hispanic black and Hispanic patients also rose significantly, increasing from 3.5 to 5.8 per 100,000 population, and from 1.1 to 3.7 per 100,000 population, respectively.
Regionally, rates of surgery were higher in the Midwest (10.8 per 100,000) and the South (10.6 per 100,000) than in the Northeast (7.8 per 100,000) and West (7.5 per 100,000). Incidence rates rose equally during the study period for both men and women.
Large urban teaching hospitals were found to have the largest rate increase when data were stratified by teaching status, a finding which caught Dr. Peery and fellow investigators by surprise.
“We had hypothesized that surgery for nonmalignant colorectal polyps would be both uncommon and declining in teaching hospitals where providers are more likely to be familiar with current guidelines and to have access to endoscopic mucosal resection,” wrote the investigators. “Instead, we found that surgery for nonmalignant colorectal polyps is both common and significantly increasing in teaching hospitals.”