FEV1 this decline (7), later several studies have shown

FEV1 is is the most widely used lung function
parameter in clinical practice and researches (6). In 1977, the landmark study of
Fletcher and Peto showed that there is an annual decline in FEV1 with age and certain
factors may accelerate this decline (7), later several studies have shown that
low value of FEV1 is an independent predictor and powerful marker of increased
risk of not only COPD, but also of lung cancer, cardiovascular diseases, and
premature death (8). Smoking has been shown to
accelerate this decline in FEV1, which is modifiable, and can be attenuated by
smoking cessation. (9) In the light of an ever-increasing
prevalence of smoking; 12% of all death worldwide are attributed to tobacco (10) use and since smoking is the most
important preventable risk factor in mortality rates, several smoking cessation
programs were initiated (11) and one approach put spirometry
into action and use the accelerated decline in FEV1 as a tool to help smoker quit,
this was the dawn of “lung age concept”(12). Simply, taking into the account
age, sex, height and ethnicity, the “lung age” of an individual, can be defined
as the age at which the measured FEV1 matches the predicted value of a
non-smoker “normal” individual(12). Morris and
Temple (1985) calculate the individual lung age by rearranging the regression
equation constructed for predicting normal reference value of force expiratory
volume at one second (FEV1) to solve for lung age( 12).They intelligently
simplify the state of the apparent premature lung aging supported with
spirometric data ;that is difficult to be conceived by the public ;to an easier
more familiar clear message ,specifically  to the smokers, that:  their lung age is older than their real
actual chronological  age is; to
psychologically warn them against the pulmonary impairment caused by smoking,
hoping that would be a potent motivator to quit smoking.Smoking in Jordan has a high
prevalence where Tobacco use data from the latest survey results as at
31 December 2016 Current cigarette smoking among youth is 17.3 % among males
and 5.4  among female ,tobacco use among
Youth is 24% (here you can add your manual refrence) (13) including the phenomenal increase
in the use of water pipe(14)(15) and lately electronic cigarette(16). It is compelling
and urgent for the heath care professional to help persuade cigarette smokers
to quit smoking and reduce suffering, pain, and premature deaths. Taking “lung
age” concept  approach  in consideration it is mandatory to test
its  applicability to suit Jordanian
population according to the American Thoracic
Society guidelines for spirometry which recommend that predictive equations be
derived from a ‘relevant’ population (17), To
our knowledge, several groups have reported revised equations predicting lung
age in worldwide populations.8–13 The American Thoracic Society guidelines for Spirometry
recommend that predictive equations be derived from a ‘relevant’
population18and should be updated at least every 10 years.19 principally   that modern automated spirometer usually
incorporate a choice of lung age equations. As far as we know, six lung age equation have been
published around the world several groups have reported revised equations that
predict lung age in populations.