{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,26]],"date-time":"2025-10-26T21:04:12Z","timestamp":1761512652051,"version":"build-2065373602"},"reference-count":20,"publisher":"CSIRO Publishing","issue":"4","license":[{"start":{"date-parts":[[2025,8,29]],"date-time":"2025-08-29T00:00:00Z","timestamp":1756425600000},"content-version":"vor","delay-in-days":4936,"URL":"https:\/\/doi.org\/10.1071\/journalslicense"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2012,8,10]]},"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>HIV infections among men who have sex with men (MSM) are increasing in Japan. Method: An anonymous self-administered questionnaire among clients of a gay bar in Osaka was used to analyse the relationship between age and unprotected anal sex (UAI). Results: The highest rate of UAI was reported among those aged \u226545 (73.3%), followed by the \u226424 (60.7%), 25\u201334 (56.3%) and 35\u201344 (54.0%) age groups (P = 0.01). In multivariate analysis, UAI was related to sex with six or more sexual partners among those aged \u226424 (adjusted odds ratio (AOR), 4.88; confidence interval (CI), 1.21\u201319.74), bisexual identity (AOR, 2.47; CI, 1.06\u20135.76) and drug use (AOR, 0.49; CI, 0.26\u20130.93 for no drug use) in the 25\u201334 age group, and no lifetime HIV testing in the 35\u201344 age group (AOR, 2.57; CI, 1.40\u20134.74). Condom purchasing and condom carrying were protective of UAI in 25\u201334, 35\u201344 and \u226545 age groups. Conclusion: Programs promoting condom use are needed for younger and older MSM.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1071\/sh11081","type":"journal-article","created":{"date-parts":[[2012,2,22]],"date-time":"2012-02-22T23:09:37Z","timestamp":1329952177000},"page":"328-333","source":"Crossref","is-referenced-by-count":9,"title":["Factors associated with unprotected anal intercourse and age among men who have sex with men who are gay bar customers in Osaka, Japan"],"prefix":"10.1071","volume":"9","author":[{"given":"Jane","family":"Koerner","sequence":"first","affiliation":[{"name":"ADepartment of Communicable Disease Epidemiology and Control, School of Nursing, Nagoya City University, 1 Kawasumi Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan."},{"name":"BDepartment of Social Gerontology, School of Public Health, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 Japan."},{"name":"ECorresponding author. Email: koerner-tky@umin.ac.jp"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Satoshi","family":"Shiono","sequence":"additional","affiliation":[{"name":"ADepartment of Communicable Disease Epidemiology and Control, School of Nursing, Nagoya City University, 1 Kawasumi Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seiichi","family":"Ichikawa","sequence":"additional","affiliation":[{"name":"ADepartment of Communicable Disease Epidemiology and Control, School of Nursing, Nagoya City University, 1 Kawasumi Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Noriyo","family":"Kaneko","sequence":"additional","affiliation":[{"name":"ADepartment of Communicable Disease Epidemiology and Control, School of Nursing, Nagoya City University, 1 Kawasumi Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8601, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hiroyuki","family":"Tsuji","sequence":"additional","affiliation":[{"name":"CMASH Osaka, Tatsumi Building 4th Floor, Doyama-cho 17-5, Kita-ku, Osaka 520-0027 Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshio","family":"Machi","sequence":"additional","affiliation":[{"name":"CMASH Osaka, Tatsumi Building 4th Floor, Doyama-cho 17-5, Kita-ku, Osaka 520-0027 Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daisuke","family":"Goto","sequence":"additional","affiliation":[{"name":"CMASH Osaka, Tatsumi Building 4th Floor, Doyama-cho 17-5, Kita-ku, Osaka 520-0027 Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tetsuro","family":"Onitsuka","sequence":"additional","affiliation":[{"name":"CMASH Osaka, Tatsumi Building 4th Floor, Doyama-cho 17-5, Kita-ku, Osaka 520-0027 Japan."},{"name":"DFaculty of Cultural Studies, Kyoto Sangyo University, Motoyama Kamigamo Kita-ku, Kyoto 603-8555, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"67","published-online":{"date-parts":[[2012,2,23]]},"reference":[{"key":"2025102617021643200_R1","doi-asserted-by":"publisher","first-page":"S30","DOI":"10.1097\/01.aids.0000390087.22565.b4","article-title":"A review of the epidemiology of HIV infection and prevention responses among MSM in Asia.","volume":"24","author":"van Griensven","year":"2010","journal-title":"AIDS"},{"key":"2025102617021643200_R2","doi-asserted-by":"publisher","first-page":"S3","DOI":"10.1097\/00042560-199700002-00002","article-title":"Descriptive Epidemiology of HIV\/AIDs in Japan, 1985\u20131994.","volume":"14","author":"Kihara","year":"1997","journal-title":"J Acquir Immune Defic Syndr Hum Retrovirol"},{"issue":"8","key":"2025102617021643200_R3","first-page":"282","article-title":"HIV\/AIDS in Japan, 2010.","volume":"32","author":"National AIDS Surveillance Committee","year":"2011","journal-title":"Infectious Agents Surveillance Report"},{"key":"2025102617021643200_R4"},{"key":"2025102617021643200_R5"},{"key":"2025102617021643200_R6"},{"issue":"9","key":"2025102617021643200_R7","doi-asserted-by":"publisher","first-page":"1098","DOI":"10.1080\/09540120802705867","article-title":"Does age affect sexual behaviour among gay men in Sydney, Melbourne and Brisbane, Australia?","volume":"21","author":"Prestage","year":"2009","journal-title":"AIDS Care"},{"key":"2025102617021643200_R8","first-page":"1","article-title":"HIV risk, prevention and testing behaviors \u2013 United States National HIV behavioral surveillance system: men who have sex with men, November 2003\u2013April 2005. 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