@Article{信息:doi 10.2196 / /公共健康。5384，作者=“西本直树与太田、水木与八原、小笠原、克彦”，标题=“从Twitter上辐射暴露相关术语的发生看福岛第一核电站事故后公众关注的持续时间:回顾性数据分析”，期刊=“JMIR公共卫生监测”，年=“2016”，月=“11月”，日=“25”，量=“2”，数=“2”，页=“e168”，关键词=“Twitter;社交媒体;公众的关注;核电站;生存分析;kaplan meier估计;infodemiology;背景:2011年3月11日日本福岛第一核电站事故发生后，社交媒体上出现了大量正面和负面的评论。目的:本研究的目的是阐明推特上发布的推文数量的趋势特征，并估计公众对事故的关注持续了多长时间。 We surveyed the attenuation period of the first term occurrence related to radiation exposure as a surrogate endpoint for the duration of concern. Methods: We retrieved 18,891,284 tweets from Twitter data between March 11, 2011 and March 10, 2012, containing 143 variables in Japanese. We selected radiation, radioactive, Sievert (Sv), Becquerel (Bq), and gray (Gy) as keywords to estimate the attenuation period of public concern regarding radiation exposure. These data, formatted as comma-separated values, were transferred into a Statistical Analysis System (SAS) dataset for analysis, and survival analysis methodology was followed using the SAS LIFETEST procedure. This study was approved by the institutional review board of Hokkaido University and informed consent was waived. Results: A Kaplan-Meier curve was used to show the rate of Twitter users posting a message after the accident that included one or more of the keywords. The term Sv occurred in tweets up to one year after the first tweet. Among the Twitter users studied, 75.32{\%} (880,108/1,168,542) tweeted the word radioactive and 9.20{\%} (107,522/1,168,542) tweeted the term Sv. The first reduction was observed within the first 7 days after March 11, 2011. The means and standard errors (SEs) of the duration from the first tweet on March 11, 2011 were 31.9 days (SE 0.096) for radioactive and 300.6 days (SE 0.181) for Sv. These keywords were still being used at the end of the study period. The mean attenuation period for radioactive was one month, and approximately one year for radiation and radiation units. The difference in mean duration between the keywords was attributed to the effect of mass media. Regularly posted messages, such as daily radiation dose reports, were relatively easy to detect from their time and formatted contents. The survival estimation indicated that public concern about the nuclear power plant accident remained after one year. Conclusions: Although the simple plot of the number of tweets did not show clear results, we estimated the mean attenuation period as approximately one month for the keyword radioactive, and found that the keywords were still being used in posts at the end of the study period. Further research is required to quantify the effect of other phrases in social media data. The results of this exploratory study should advance progress in influencing and quantifying the communication of risk. ", issn="2369-2960", doi="10.2196/publichealth.5384", url="http://publichealth.www.mybigtv.com/2016/2/e168/", url="https://doi.org/10.2196/publichealth.5384", url="http://www.ncbi.nlm.nih.gov/pubmed/27888168" }