Analysis of news of the Japanese asbestos panic: a supposedly resolved issue that turned out to be a time bomb

Our plain-English summary of Analysis of news of the Japanese asbestos panic: a supposedly resolved issue that turned out to be a time bomb, by Y. Takahashi, K. Miyaki, T. Nakayama (Journal of Public Health, 2007).

The study

• Authors: Y. Takahashi, K. Miyaki, T. Nakayama
• Journal: Journal of Public Health
• Published: 2007;29(1):62-9
• Cited by: 6 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

Background: Asbestos-linked public health problems were widely reported in Japan, in 2005. The objective is to apply text mining with network analysis to characterize these problems.

Methods: Text mining with network analysis of newspaper headlines including the word 'asbestos' published in 1987 and 2005 was conducted. Outcome measures are occurrence of the words and simultaneous occurrence of two words in the newspaper headlines.

Results: In 36 headlines, which contained the word 'asbestos' in 1987, the word 'pollution' (40%) appeared most frequently, followed by 'removal' (31%) and 'campaign' (29%). For combinations of words, the following occurred most frequently: 'campaign and expulsion' (26%) followed by 'removal and campaign' (14%). Of 293 headlines in 2005, the following words appeared: 'hazard' (31%), 'person' (16%) and 'death' (13%). For combinations, the following appeared: 'person and death' (9%). Asbestos pollution and removal campaigns were reported in 1987, but the death of citizens was reported in 2005.

Conclusions: Text mining with network analysis, which presents one of the methods for visualization of text data, suggests the following insight. Insufficient steps against asbestos had been taken for 20 years, which is compatible with the latency period. It has resulted in widespread exposure to asbestos and more severe asbestos-related public health problems among citizens. This methodology suggests that analyzing text data by this method can serve future surveillance and efficient use of epidemiological knowledge.

In plain English

This study examined how one major Japanese newspaper reported on asbestos. The authors searched the Asahi Shimbun for headlines containing 'asbestos' or its Japanese equivalent 'ishiwata'. They used computer text mining with network analysis to count how often words, and pairs of words, appeared. They analyzed 36 headlines from 1987 and 293 from 2005. In 1987, 'pollution' appeared in 40% of headlines, 'removal' in 31% and 'campaign' in 29%. 'Campaign' and 'expulsion' appeared together in 26%. Coverage centred on removing asbestos from public schools and on asbestos pollution. In 2005, 'hazard' appeared in 31% of headlines, 'person' in 16% and 'death' in 13%, with 'person' and 'death' together in 9%. There were few headlines between 1990 and 2004. The authors concluded that 20 years of silence, which they described as compatible with the latency period for developing tumours, turned out to be a 'time bomb'. The study counted headline words only. The authors noted that it did not try to show cause and effect between newspapers and public thinking, and that it used a single newspaper.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Text mining with network analysis of newspaper headlines, comparing word frequencies and word pairings in two years
• Who was studied: Headlines in the Asahi Shimbun newspaper (Japan) containing 'asbestos' or 'ishiwata': 36 headlines from 1987 and 293 from 2005
• Exposure: No asbestos exposure was measured. The subject was newspaper coverage: headlines using the word 'asbestos' or its Japanese equivalent 'ishiwata'
• Main results:
  • Among the 36 headlines from 1987, 'pollution' appeared in 40%, 'removal' in 31% and 'campaign' in 29%
  • In the 1987 headlines, 'campaign' and 'expulsion' appeared together in 26%
  • The 1987 network split mainly into two parts: the campaign to remove asbestos from public schools, and asbestos pollution
  • Among the 293 headlines from 2005, 'hazard' appeared in 31%, 'person' in 16%, 'death' in 13% and 'workman's compensation' in 8%
  • In the 2005 headlines, 'person' and 'death' appeared together in 9%, 'harm' and 'person' in 8%, and 'harm' and 'death' in 6%
  • There were few asbestos headlines between 1990 and 2004
• The authors' conclusion: The authors concluded that the 1987 coverage focused on asbestos removal from public schools and the 2005 coverage on health hazards. In their interpretation, 20 years of silence, which they described as compatible with the latency period for developing tumours, became a 'time bomb' that ended in deaths among the general public in 2005.
• Limitations the authors state:
  • Newspapers are not the only source of public health information
  • Only one newspaper, the Asahi Shimbun, was examined
  • Words carry different meanings between English and Japanese. The authors checked the exact meaning of words in all headlines to address this.
  • The study does not attempt to show a causal effect between newspapers and how the general public thinks

Topics

Medical terms in this study, explained in our Lexicon: Latency.

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