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Japan

The prevalence of asthma in adults in Japan is rapidly increasing, however there is a significant difference for the children in Japan. The mean prevalence of asthma in Japan has increased from about 1% to 10% or higher in children and to about 6–10% in adults since the 1960s. There has been a 1.5 fold increase in the prevalence of asthma per decade in Japan from the 1960s. Three surveys done from 1985, 1999 and 2006 show adult asthma is increasing, while the same surveys indicate that the prevalence of asthma in children is decreasing.

Increasing Frequency - Regional Differences

A survey conducted by the ISSAC Steering Committee conducted a study from 1992 to 1993 in adults aged 22 to 44 comparing the prevalence of asthma in 10 developed countries. An important note to consider is the population differences between these countries. The United States population in 1992 was 256.9 million, 14.5 times that of Australia (17.5 mil), and 4.5 times of the United Kingdom (57.51 mil). However, Australia and the UK have a higher prevalence the US by 2.4 on the lower end 4.6 on the higher end. In another study taken in 1992 for Japan the prevalence of asthma in Japan was 13% with a a population of 124.2 mil. Prevalence (%) in ages 20-44 from the years

1992-93 including Japans data from 2005.

"Japanese guidelines for adult asthma 2017". Allergology International. 66 (2): 163–189. 2017-04-01. doi:10.1016/j.alit.2016.12.005. ISSN 1323-8930.

'''Iwanaga, Takashi; Tohda, Yuji (10 2016). "Epidemiology of asthma in Japan". ''Nihon Rinsho. Japanese Journal of Clinical Medicine''. 74 (10): 1603–1608. ISSN 0047-1852. PMID 30551268'''

www.census.gov. Retrieved 2020-11-11.

ecas.ec.europa.eu. Retrieved 2020-11-11.

datatopics.worldbank.org. Retrieved 2020-11-11.