LAUSR

Xiaohan Wang Shuai Miao 2 1Department of Anesthesiology, Xuzhou Medical University, Xuzhou, Jiangsu, People’s Republic of China; 2Department of Anesthesiology, The Affiliated Wuxi People's Hospital of Nanjing Medical University, Wuxi, Jiangsu, People’s Republic of China Dear editor We read the observational study “Sufentanil Sublingual Tablet System (SSTS) for the management of postoperative pain after major abdominal and gynecological surgery within an ERAS protocol: an observational study” of Stefano Turi et al. published in August 2019, Volume 12, p2313–2319 with great pleasure. I think that the findings detected in this study will contribute to the clinical practice. However, the statistical analyses were not appropriate. In the "Data analysis" section, the authors stated that