{"id":3418,"date":"1998-12-05T00:00:00","date_gmt":"1998-12-05T05:00:00","guid":{"rendered":"https:\/\/icesontario.wpengine.com\/journal-articles\/cohort-study-on-circumcision-of-newborn-boys-and-subsequent-risk-of-urinary-tract-infection\/"},"modified":"2023-06-14T19:31:40","modified_gmt":"2023-06-14T23:31:40","slug":"cohort-study-on-circumcision-of-newborn-boys-and-subsequent-risk-of-urinary-tract-infection","status":"publish","type":"journal_article","link":"https:\/\/www.ices.on.ca\/fr\/publications\/journal-articles\/cohort-study-on-circumcision-of-newborn-boys-and-subsequent-risk-of-urinary-tract-infection\/","title":{"rendered":"Cohort study on circumcision of newborn boys and subsequent risk of urinary-tract infection"},"content":{"rendered":"<p><strong>Background<\/strong> &#x2014; A decrease in risk of urinary-tract infection is one of the most commonly given reasons for circumcision of newborn boys. Previous studies have reported rates of UTI to be 10-20 times higher in uncircumcised than in circumcised boys. This population-based cohort study followed neonates in Ontario, Canada, prospectively to study the relation between circumcision and subsequent UTI risk. <\/p>\n<p><strong>Methods<\/strong> &#x2014; Eligible boys were born to residents of Ontario between April 1, 1993, and March 31, 1994. Hospital discharge data was used to follow up boys until March 31, 1996. <\/p>\n<p><strong>Findings<\/strong> &#x2014; Of 69,100 eligible boys, 30,105 (43.6%) were circumcised and 38 995 (56.4%) uncircumcised. 888 boys circumcised after the first month of life were excluded. 29,217 uncircumcised boys were matched to the remaining circumcised boys by date of birth. The 1-year probabilities of hospital admission for UTI were 1.88 per 1000 person-years of observation (83 cases up to end of follow-up) in the circumcised cohort and 7.02 per 1000 person-years (247 cases up to end of follow-up) in the uncircumcised cohort (p&lt;0.0001). The estimated relative risk of admission for UTI by first-year follow-up indicated a significantly higher risk for uncircumcised boys than for circumcised boys (3.7 [2.8-4.9]). 195 circumcisions would be needed to prevent one hospital admission for UTI in the first year of life. <\/p>\n<p><strong>Interpretation<\/strong> &#x2014; Although these findings support the notion that circumcision may protect boys from UTI, the magnitude of this effect may be less than previously estimated.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Background &#x2014; A decrease in risk of urinary-tract infection is one of the most commonly given reasons for circumcision of newborn boys. Previous studies have reported rates of UTI to be 10-20 times higher in uncircumcised than in circumcised boys. This population-based cohort study followed neonates in Ontario, Canada, prospectively to study the relation between [&hellip;]<\/p>\n","protected":false},"template":"","migration-helper-automated":[],"migration-manual":[],"topic":[49,27,25],"migration-helper-qa-sample-set":[],"class_list":["post-3418","journal_article","type-journal_article","status-publish","hentry","topic-kidney-disease","topic-pediatrics","topic-surgery"],"acf":{"citation":"To T, Agha M, Dick PT, Feldman W. <em>Lancet<\/em>. 1998; 352(9143):1813-6.","source_url":"http:\/\/www.thelancet.com\/journals\/lancet\/article\/PIIS0140-6736(98)02392-7\/fulltext","ices_scientist":[1111,1384],"site":[6735,6733],"research_program":[6746],"news_release":[],"journal_article":[],"atlas":[],"research_report":[],"infographic":[],"video":[],"downloads":null,"links":null,"sitecore_item_id":"F5677066-0E82-4BDA-BC00-3D55B02A1EE5","sitecore_item_name":"Cohort-study-on-circumcision-of-newborn-boys-and-subsequent-risk-of-urinary-tract-infection","sitecore_field_values":"{\n  \"Title\": \"Cohort study on circumcision of newborn boys and subsequent risk of urinary-tract infection\",\n  \"Short title\": \"Cohort study on circumcision\",\n  \"Citation\": \"<p>To T, Agha M, Dick PT, Feldman W. <em>Lancet<\/em>. 1998; 352(9143):1813-6.<\/p>\",\n  \"Abstract\": \"<p><strong>Background<\/strong> &mdash; A decrease in risk of urinary-tract infection is one of the most commonly given reasons for circumcision of newborn boys. Previous studies have reported rates of UTI to be 10-20 times higher in uncircumcised than in circumcised boys. This population-based cohort study followed neonates in Ontario, Canada, prospectively to study the relation between circumcision and subsequent UTI risk. <\/p>n<p><strong>Methods<\/strong> &mdash; Eligible boys were born to residents of Ontario between April 1, 1993, and March 31, 1994. Hospital discharge data was used to follow up boys until March 31, 1996. <\/p>n<p><strong>Findings<\/strong> &mdash; Of 69,100 eligible boys, 30,105 (43.6%) were circumcised and 38 995 (56.4%) uncircumcised. 888 boys circumcised after the first month of life were excluded. 29,217 uncircumcised boys were matched to the remaining circumcised boys by date of birth. The 1-year probabilities of hospital admission for UTI were 1.88 per 1000 person-years of observation (83 cases up to end of follow-up) in the circumcised cohort and 7.02 per 1000 person-years (247 cases up to end of follow-up) in the uncircumcised cohort (p&lt;0.0001). The estimated relative risk of admission for UTI by first-year follow-up indicated a significantly higher risk for uncircumcised boys than for circumcised boys (3.7 [2.8-4.9]). 195 circumcisions would be needed to prevent one hospital admission for UTI in the first year of life. <\/p>n<p><strong>Interpretation<\/strong> &mdash; Although these findings support the notion that circumcision may protect boys from UTI, the magnitude of this effect may be less than previously estimated.<\/p>n<p><a href=\"http:\/\/www.thelancet.com\/journals\/lancet\/article\/PIIS0140-6736(98)02392-7\/fulltext\" title=\"Opens external link\">View full text<\/a><\/p>\",\n  \"Keywords\": \"{A42B9A82-A9B2-42CC-BD2F-105B04B0A51E}|{9F514AF9-2526-48FE-8414-54C443CF99AD}|{3520E276-FC47-4BE8-BC0D-5FD075E6DBEF}\",\n  \"Research Programs\": \"{5B1AF319-EC9B-4BF0-A9CD-D066ABE49D71}|{CFE36C89-C969-4C23-B5E4-1BA9E5BDC273}\",\n  \"ICES Locations\": \"{FBE2D1B1-C0BA-423F-8D16-39466B6C1424}|{4FCAABBA-14A5-42E6-8F33-BC6C2F1D9908}\",\n  \"ICES Scientists\": \"{198CB764-0CEA-499E-A508-1CAAAD283C90}|{21862FB9-DD44-41AF-B1A5-A3B5D2474169}\",\n  \"Posted Date\": \"19981205T000000\"\n}","previous_url":"https:\/\/www.ices.on.ca\/Publications\/Journal-Articles\/1998\/January\/Cohort-study-on-circumcision-of-newborn-boys-and-subsequent-risk-of-urinary-tract-infection"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>ICES | Cohort study on circumcision of newborn boys and subsequent risk of urinary-tract infection<\/title>\n<meta name=\"description\" content=\"Background &#x2014; A decrease in risk of urinary-tract infection is one of the most commonly given reasons for circumcision of newborn boys. 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