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Statistical analysis

KF Koh Fukushi
KT Keiichi Tominaga
KN Kazunori Nagashima
AK Akira Kanamori
NI Naoya Izawa
MK Mimari Kanazawa
TS Takako Sasai
HH Hideyuki Hiraishi
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For statistical analysis, χ2 test, t test, and Mann-Whitney U test were used. Logistic regression analysis was also performed using hospital stay of 20 d or more as a dependent variable. SPSS version (IBM SPSS Statistics 21; IBM Japan, Ltd.) was used for statistical analysis processing. This study was approved by the life ethics committee of our institution.

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