Abstract
BACKGROUNDThe life expectancy is an important measure for describing health status among population. Several studies from the United States and Europe showed the harm of smoking by describing the life expectancies with different smoking status. No such study is examined in Japan, the country with the world s highest life expectancy irrespective of high smoking rate among men.METHODSThe abridged life table method was applied to calculate the life expectancies of men and women among different smoking status from age 40 until age 85. Age-specific mortality rates stratified by different smoking status were obtained from follow-up data from random sample in Japanese population (NIPPON DATA80).RESULTSProportion of current smokers was 62.9% in men and 8.8% in women at the baseline survey in 1980. The life expectancies of 40-year-old never smokers, ex-smokers and current smokers were 42.1, 40.4, and 38.6 years in men and 45.6, 45.9, and 43.4 years in women. The life expectancy of 40-year-old men who smoked less than one pack per day was 39.0 and was longer than that of those who smoked one or two packs (38.8) and more than two packs (38.1).CONCLUSIONLife expectancy decreased gradually as the grade of smoking increased in the Japanese population.
Highlights
MethodsThe abridged life table method was applied to calculate the life expectancies of men and women among different smoking status from age 40 until age 85
The life expectancy is an important measure for describing health status among population
Longevity in Japan is suffered from smoking, the difference of life expectancy between never smokers and current smokers is not yet examined in Japan
Summary
The abridged life table method was applied to calculate the life expectancies of men and women among different smoking status from age 40 until age 85. Age-specific mortality rates stratified by different smoking status were obtained from follow-up data from random sample in Japanese population (NIPPON DATA80). Age-specific mortality rates among Japanese with different smoking statuses were calculated from the data of the nationwide cohort study in Japan, called the NIPPON DATA80 Baseline examination was conducted in year 1980 and the details of the study were described elsewhere.[7,12,13] Persons who were aged 30 and over in 1980 were enrolled by stratified random sampling throughout. A total of 10,546 participants (men: 4,639, women: 5,907) were followed until the end of 1999.
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