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Assessing the Reliability and Validity of Principles for Health-Related Information on Social Media (PRHISM) for Evaluating Breast Cancer Treatment Videos on YouTube: Instrument Validation Study

Assessing the Reliability and Validity of Principles for Health-Related Information on Social Media (PRHISM) for Evaluating Breast Cancer Treatment Videos on YouTube: Instrument Validation Study

Therefore, as a pilot test, the investigator (HK [Hiroki Kusama]) evaluated 50 videos to establish this distribution in Multimedia Appendix 2. Based on the above settings, the number of videos was determined through a simulation experiment conducted 10,000 times. Assuming an alternative hypothesis kappa coefficient of 0.61, the number of videos required to reject the null hypothesis of 0.53 with over 80% power at a 2-sided significance level of 10% was calculated to be 55 for 6 evaluators.

Hiroki Kusama, Yoshimitsu Takahashi, Shunichiro Orihara, Kayo Adachi, Yumiko Ishizuka, Ryoko Semba, Hidetaka Shima, Yoshiya Horimoto, Hiroshi Kaise, Masataka Taguri, Sho Inoue, Takeo Nakayama, Takashi Ishikawa

JMIR Infodemiology 2025;5:e66416