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The primary outcome was opioid consumption during the 24\u00a0h after surgery. Secondary outcomes included time to first request for analgesia, the number of bolus, pain, sedation, nausea, vomiting, respiratory depression, and bradycardia. The prominent pain that caused patients to press the analgesic device was also recorded.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Oxycodone consumption (14.42\u2009\u00b1\u20092.83) was less than morphine consumption (20.14\u2009\u00b1\u20093.83). Compared with the morphine group, the total number of bolus (78\n                      <jats:italic>vs<\/jats:italic>\n                      123) was less and the average time to first request for analgesia (97.27\u2009\u00b1\u200959.79\n                      <jats:italic>vs<\/jats:italic>\n                      142.17\u2009\u00b1\u200951) was longer in the oxycodone group. The incidence of nausea was higher in the morphine group than in the oxycodone group at 0\u20132\u00a0h (45.45%\n                      <jats:italic>vs<\/jats:italic>\n                      17.19%), 2\u20134\u00a0h (50%\n                      <jats:italic>vs<\/jats:italic>\n                      17.19%),12\u201324\u00a0h (40.91%\n                      <jats:italic>vs<\/jats:italic>\n                      13.04%) and 0\u201324\u00a0h (39.17%\n                      <jats:italic>vs<\/jats:italic>\n                      19.13%). The overall incidence of vomiting was higher in the morphine group (27.27%\n                      <jats:italic>vs<\/jats:italic>\n                      13.92%). There was no difference in visual analogue scale score, the incidence of respiratory depression, and bradycardia between groups. Of the three types of pain that prompted patients to request analgesia, the incidence of visceral pain was highest (59.9%,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009&lt;\u20090.01).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Oxycodone was more potent than morphine for analgesia after laparoscopic endometriosis resection, and oxycodone has fewer side effects than morphine.<\/jats:p>\n                    <jats:p>\n                      <jats:bold>Name of the registry:<\/jats:bold>\n                      Chinese Clinical Trial Registry\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>Trial registration number:<\/jats:bold>\n                      ChiCTR1900021870\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>URL of trial registry record:<\/jats:bold>\n                      <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" xlink:href=\"http:\/\/www.chictr.org.cn\/edit.aspx?pid=35799&amp;htm=4\" ext-link-type=\"uri\">http:\/\/www.chictr.org.cn\/edit.aspx?pid=35799&amp;htm=4<\/jats:ext-link>\n                    <\/jats:p>\n                    <jats:p>\n                      <jats:bold>Date of registration:<\/jats:bold>\n                      2019\/3\/13 0:00:00\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12871-021-01417-3","type":"journal-article","created":{"date-parts":[[2021,7,21]],"date-time":"2021-07-21T00:03:38Z","timestamp":1626825818000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["RETRACTED ARTICLE: Oxycodone versus morphine for analgesia after laparoscopic endometriosis resection"],"prefix":"10.1186","volume":"21","author":[{"given":"Lijun","family":"Niu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lihong","family":"Chen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yanhua","family":"Luo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenkao","family":"Huang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yunsheng","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,7,21]]},"reference":[{"key":"1417_CR1","doi-asserted-by":"publisher","first-page":"931","DOI":"10.1016\/j.fertnstert.2017.09.006","volume":"108","author":"O Donnez","year":"2017","unstructured":"Donnez O, Roman H. 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Please see the Retraction Notice for more detail:","order":7,"name":"change_details","label":"Change Details","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"https:\/\/doi.org\/10.1186\/s12871-021-01540-1","URL":"https:\/\/doi.org\/10.1186\/s12871-021-01540-1","order":8,"name":"change_details","label":"Change Details","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"This trial was performed in accordance with the Declaration of Helsinki and was approved by the Institutional Ethical Review Committee for Clinical Trials of The First Affiliated Hospital of Sun Yat-sen University\u00a0(NO. [2019]043). 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