著者

伊藤 正範 Masanori Ito

出版者

関西学院大学商学研究会 ; 1952-

雑誌

商学論究 (ISSN:02872552)

巻号頁・発行日

vol.63, no.4, pp.95-113, 2016-03

著者

伊藤 正範 Masanori Ito

雑誌

商学論究 (ISSN:02872552)

巻号頁・発行日

vol.63, no.4, pp.95-113, 2016-03-10

著者

Tomomi KIMURA Toshifumi SUGITANI Takuya NISHIMURA Masanori ITO

出版者

Japanese Society for Pharmacoepidemiology

雑誌

薬剤疫学 (ISSN:13420445)

巻号頁・発行日

vol.24, no.2, pp.53-64, 2019-08-27 (Released:2019-10-07)

参考文献数

25

被引用文献数

15 14

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Objective: The Charlson and Elixhauser comorbidity indices (CCI and ECI, respectively) are widely used to study comorbid conditions but these indices have not been validated in Japanese datasets. In this study, our objective was to validate and recalibrate CCI and ECI in a Japanese insurance claims database.Methods: All hospitalizations for patients aged≥18 years discharged between January 2011 and December 2016 were randomly allocated to derivation and validation cohorts. Predictability for hospital death and re-admission was evaluated using C statistics from multivariable logistic regression models including age, sex, and individual CCI/ECI conditions at admission month or the derived score in the derivation cohort. After stepwise variable selection, weighted risk scores for each condition were re-assigned using odds ratios (CCI) or beta coefficients (ECI). The modified models were evaluated in the validation cohort.Results: The original CCI/ECI had good discriminatory power for hospital death: C statistics (95% confidence interval) for individual comorbidities and score models were 0.845 (0.835-0.855) and 0.823 (0.813-0.834) for CCI, and 0.839 (0.828-0.850) and 0.801 (0.790-0.812) for ECI, respectively. Modified CCI and ECI had reduced numbers of comorbidities (17 to 10 and 30 to 21, respectively) but maintained comparable discriminatory abilities: C statistics for modified individual comorbidities and score models were 0.843 (0.833-0.854) and 0.838 (0.827-0.848) for CCI, and 0.840 (0.828-0.852) and 0.839 (0.827-0.851) for ECI, respectively.Conclusions: The original and modified models showed comparable discriminatory abilities and both can be used in future studies using insurance claims databases.

著者

伊藤 正範 Masanori Ito

出版者

関西学院大学商学研究会 ; 1952-

雑誌

商学論究 (ISSN:02872552)

巻号頁・発行日

vol.60, no.1, pp.647-665, 2012-12

著者

Hui Lan Urumu Tsunogai Fumiko Nakagawa Masanori Ito Ryo Shingubara Yuko Miyoshi Shuichi Hara

出版者

GEOCHEMICAL SOCIETY OF JAPAN

雑誌

GEOCHEMICAL JOURNAL (ISSN:00167002)

巻号頁・発行日

pp.GJ23005, (Released:2023-02-10)

被引用文献数

1

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To clarify the sources and fate of CH4 enriched in coastal seawaters, we determined the distribution of both the concentrations and dual stable isotope compositions (δ13C and δ2H) of dissolved CH4 in the bays of Ise and Mikawa in Japan during five sampling campaigns from 2013 to 2020, together with those in the major inflows of the Kiso, Nagara, and Yahagi Rivers. Excess CH4 were found in the surface layer of Ise Bay, and their δ13C and δ2H values were close to those of CH4 enriched in the major inflows, but deviated from those of CH4 in the sedimentary layer at the bottom of Ise Bay. The oxidation rates of CH4 in the water columns were negligibly small during the incubation experiments. In conclusion, the excess CH4 in the surface layer of Ise Bay was derived from the inflows. The CH4 enrichment in the freshwater sediments of the inflows showing up to four orders of magnitude higher CH4 concentrations than those in the sediments of Ise Bay supported this conclusion. Similar results were obtained in Mikawa Bay. The total emission flux of CH4 from the estuary area of Ise Bay was larger than the influx of CH4 into Ise Bay via the inflows, suggesting that the CH4 dissolved in the inflows was emitted into the atmosphere immediately after inflowing into the bay water.

著者

Naoki Kado Masanori Ito Toshiaki Suzuki Hiroshi Ando

出版者

The Society of Physical Therapy Science

雑誌

Journal of Physical Therapy Science (ISSN:09155287)

巻号頁・発行日

vol.24, no.10, pp.949-952, 2012 (Released:2012-12-28)

参考文献数

20

被引用文献数

4 3

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[Purpose] This study evaluated the effects of voluntary arm movements performed at various difficulty levels on the excitability of spinal motor neurons in the contralateral arm using F-wave analysis. [Subjects] A total of 20 healthy volunteers participated in this study after giving their written informed consent. [Methods] With the subject seated on a chair, F-waves were elicited from the right abductor pollicis brevis during movement tasks performed by the left arm. The tasks were repetitive movements between two targets placed 20 cm apart on a desk. The subject was instructed to accurately touch the targets with the tip of a pen. In order to adjust the difficulty level, the size of the targets was changed as follows: 5 cm × 15 cm (width × length) for task 1, 0.5 cm × 15 cm for task 2, and 0.25 cm × 15 cm for task 3. The control task was to remain in the sitting position on the chair. [Results] The amplitude ratio of F/M significantly increased during tasks 2 and 3 compared with that during the control task. [Conclusion] Voluntary arm movements performed at a high difficulty level increase the excitability of spinal motor neurons in the contralateral arm.

著者

伊藤 正範 Masanori Ito

雑誌

商学論究 (ISSN:02872552)

巻号頁・発行日

vol.64, no.6, pp.89-105, 2017-03-10