[/floatr]The Japan Society of Ningen Dock has looked at the results of 3,080,000 health checks in 2010. 8.4% received a completely clean bill of health which is the lowest percentage recorded. The society started analyzing nationwide data in 1984 when the same figure was as high as 29.8%. It has been declining steadily every year since. By gender, 7.3% of men were healthy against 10.2% women. By age, 17.7% of under 40s were healthy and this figure falls to 3.7% for over 60s. As that last classification indicates, demographics explain a good part of why clean bill ratio has been falling. As the population ages, there are fewer younger Japanese to offset the wear and tear appearing in older generations. It's also the reason Okinawans, who have a reputation for longevity, score worst in the country on this count. Their 5.5% clean bill compares with a high of 13.3% in the Chugoku and Shikoku regions.