• Kidong Kim, Yoonchang Han, Suyeon Jeong, Kibbeum Doh, Hyeoun-Ae Park, Kyogu Lee, Moonsuk Cho, and Soyeon Ahn.
• Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Bundang-gu, Seongnam-si, Gyeonggi-do, The Republic of Korea.
• Methods Inf Med. 2019 Dec 1; 58 (6): 222-228.

Objectives The current study sought to evaluate whether nursing narratives can be used to predict postoperative length of hospital stay (LOS) following curative surgery for ovarian cancer.Methods A total of 33 patients, aged over 65 years, underwent curative surgery for newly diagnosed ovarian cancer between 2008 and 2012. Based on the median postoperative LOS, patients were divided into two groups: long-stay (>12 days; n = 13) and short-stay (≤12 days; n = 20). Patterns in nursing narratives were examined and compared through a quantitative analysis. Specifically, the total number (TN) of narratives pertaining to care and the standardized number (SN), which was calculated by dividing the TN by the LOS, were compared. Experts evaluated the relevance of the phrases extracted. LOS was then predicted using machine learning techniques.Results The median postoperative LOS was 18 days (interquartile range [IQR]: 16-24 days) in the long-stay group and 9.5 days (IQR: 8-11.25 days) in the short-stay group. In the long-stay group, surgery duration was longer. Overall, patients in the long-stay group showed a higher volume of nursing narratives compared with patients in the short-stay group (SN: 68 vs. 46, p = 0.021). Thirty-two of the most frequently used nursing narratives were selected from 998 uniquely defined nursing narratives. Multiple t-tests were used to compare the TN and real standardized number (RSN; minimum p < 0.1). Mean and standard deviation of classification results of long-short term memory recurrent neural networks for long and short stays were 0.7774 (0.105), 0.745 (0.098), 0.739 (0.107), and 0.765 (0.115) for F1-measure, precision, recall, and area under the receiver operating characteristic, respectively. Agreement between the differential narratives as assessed by statistical methods and the expert response was low (52.6% agreement; McNemar's test p = 0.012).Conclusions Statistical tests showed that nursing narratives that utilized the words "urination," "food supply," "bowel mobility," or "pain" were related to hospital stay in elderly females with ovarian cancer. Additionally, machine learning effectively predicted LOS.Summary The current study sought to determine whether elements of nursing narratives could be used to predict postoperative LOS among elderly ovarian cancer patients. Results indicated that nursing narratives that used the words "urination," "food supply," "bowel mobility," and "pain" significantly predicted postoperative LOS in the study population. Additionally, it was found that machine learning could effectively predict LOS based on quantitative characteristics of nursing narratives.Georg Thieme Verlag KG Stuttgart · New York.

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