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Paper Abstract and Keywords
Presentation 2014-06-15 09:25
Extraction of Determinants of Postoperative Length of Stay from Operation Records
Takanori Yamashita, Yoshifumi Wakata, Satoshi Hamai, Yasuharu Nakashima, Yukihide Iwamoto, Naoki Nakashima, Sachio Hirokawa (Kyushu Univ.) NLC2014-11
Abstract (in Japanese) (See Japanese page) 
(in English) Secondary use of clinical text data are gaining much attention in improving the quality and the efficiency of medical treatment. Although there is some case studies of medical examination text data, there are not many examples feed back to the medical-examination spot. The present paper analyses the operation records of total hip arthroplasty.
We extracted feature words that characterize the two peaks which appeared in distribution of postoperative hospital days using SVM(support vector machine) and FS (feature selection). The models gained by optimal FS attained 60% accuracy as prediction performance.
We applied logistic regression analysis to estimate postoperative length of stay from the extracted feature words. Most words were not statistically significant except two words.
Keyword (in Japanese) (See Japanese page) 
(in English) critical path / critical indicator / hip replacement arthroplasty / SVM / logistic regression analysis / / /  
Reference Info. IEICE Tech. Rep., vol. 114, no. 81, NLC2014-11, pp. 59-64, June 2014.
Paper # NLC2014-11 
Date of Issue 2014-06-07 (NLC) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF NLC2014-11

Conference Information
Committee NLC  
Conference Date 2014-06-14 - 2014-06-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Kyushu Institute of Technology 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To NLC 
Conference Code 2014-06-NLC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Extraction of Determinants of Postoperative Length of Stay from Operation Records 
Sub Title (in English)  
Keyword(1) critical path  
Keyword(2) critical indicator  
Keyword(3) hip replacement arthroplasty  
Keyword(4) SVM  
Keyword(5) logistic regression analysis  
1st Author's Name Takanori Yamashita  
1st Author's Affiliation Kyushu University (Kyushu Univ.)
2nd Author's Name Yoshifumi Wakata  
2nd Author's Affiliation Kyushu University (Kyushu Univ.)
3rd Author's Name Satoshi Hamai  
3rd Author's Affiliation Kyushu University (Kyushu Univ.)
4th Author's Name Yasuharu Nakashima  
4th Author's Affiliation Kyushu University (Kyushu Univ.)
5th Author's Name Yukihide Iwamoto  
5th Author's Affiliation Kyushu University (Kyushu Univ.)
6th Author's Name Naoki Nakashima  
6th Author's Affiliation Kyushu University (Kyushu Univ.)
7th Author's Name Sachio Hirokawa  
7th Author's Affiliation Kyushu University (Kyushu Univ.)
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Date Time 2014-06-15 09:25:00 
Presentation Time 25 
Registration for NLC 
Paper # IEICE-NLC2014-11 
Volume (vol) IEICE-114 
Number (no) no.81 
Page pp.59-64 
#Pages IEICE-6 
Date of Issue IEICE-NLC-2014-06-07 

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