Changes in Physical Activity Across Cancer Diagnosis and Treatment Based on Smartphone Step Count Data Linked to a Japanese Claims Database: Retrospective Cohort Study

Yoshihide Inayama   ^{1, 2} , MD ;   Ken Yamaguchi   ¹ , MD, PhD ;   Kayoko Mizuno   ^{2, 3} , MD, PhD ;   Sachiko Tanaka-Mizuno   ^{2, 3, 4} , PhD ;   Ayami Koike   ¹ , MD ;   Nozomi Higashiyama   ¹ , MD ;   Mana Taki   ¹ , MD, PhD ;   Koji Yamanoi   ¹ , MD, PhD ;   Ryusuke Murakami   ¹ , MD, PhD ;   Junzo Hamanishi   ¹ , MD, PhD ;   Satomi Yoshida   ^{2, 5} , PhD ;   Masaki Mandai   ¹ , MD, PhD ;   Koji Kawakami   ² , MD, PhD

¹ Department of Gynecology and Obstetrics, Graduate School of Medicine and Faculty of Medicine, Kyoto University, Kyoto, Japan

² Department of Pharmacoepidemiology, Graduate School of Medicine and Public Health, Kyoto University, Kyoto, Japan

³ Department of Digital Health and Epidemiology, Graduate School of Medicine and Public Health, Kyoto University, Kyoto, Japan

⁴ Laboratory of Epidemiology and Prevention, Kobe Pharmaceutical University, Kobe, Japan

⁵ Institute of Medicine, University of Tsukuba, Tsukuba, Japan