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However, no studies reported an association between PUD and the number of household members. We showed the number of family members affected by PUD based on sex in a Korean population. This cross-sectional study used 1998\u20132009 data from the Korea National Health and Nutrition Examination Survey of the Korea Centers for Disease Control and Prevention. Multiple binary logistic regression models adjusted for confounders were constructed to analyze the association of PUD with the number of household members. The number of household members was associated with PUD, age, body mass index (BMI), waist circumference, systolic blood pressure, hemoglobin, glucose, location (urban\/rural), income, education level, stress, current drinking, and smoking in both sexes. Men with other household members had a higher PUD risk compared to men or women living alone (reference), and the opposite was observed for women. Men with 4 household members had a higher PUD risk than men living alone in the model adjusted for age, BMI, income, location, education, and stress (OR\u2009=\u20092.04 [95% CI 1.28\u20133.27], <jats:italic>p<\/jats:italic> value\u2009=\u2009.003). Women with more than 6 household members had a lower PUD risk than women living alone in the adjusted model (OR\u2009=\u20090.50 [0.33\u20130.75], <jats:italic>p<\/jats:italic> value\u2009=\u2009.001). Women with more household members had a lower PUD risk. However, more men had PUD than women regardless of the number of household members.<\/jats:p>","DOI":"10.1038\/s41598-021-84892-5","type":"journal-article","created":{"date-parts":[[2021,3,5]],"date-time":"2021-03-05T11:03:22Z","timestamp":1614942202000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["The number of household members as a risk factor for peptic ulcer disease"],"prefix":"10.1038","volume":"11","author":[{"given":"Mi Hong","family":"Yim","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keun Ho","family":"Kim","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bum Ju","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,3,5]]},"reference":[{"key":"84892_CR1","doi-asserted-by":"publisher","first-page":"613","DOI":"10.1016\/S0140-6736(16)32404-7","volume":"390","author":"A Lanas","year":"2017","unstructured":"Lanas, A. & Chan, F. 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