Association between PPI use and uncomplicated PUD development in naïve current ASA users in a UK primary care population during 1997–2005.

Abbreviations: ASA, acetylsalicylic acid; CI, confidence interval; NSAID, nonsteroidal anti-inflammatory drug; OR, odds ratio; PCP, primary care physician; PPI, proton pump inhibitor; PUD, peptic ulcer disease.aRelative to non-use of a PPI, and adjusted according to sex, age, year of index date, number of PCP visits and specialist referrals in the year before the index date, smoking status, and use of paracetamol and NSAIDs.