Nikolaos Polyzos, MD, PhD, of the Centre for Reproductive Medicine in Belgium, and colleagues found that ectopic pregnancies (EP) declined over a period of 12 years following ART (crude odds ratio 0.96 per year, 95% CI 0.95-0.97), even after adjusting for potential confounders (adjusted OR 0.97 per year, 95% CI 0.95-0.98).