It seems reasonable to hypothesize that there is no true cut-off point but, rather, a transition zone, within which the prognosis gradually worsens.
Indeed, it is possible that due to experimental error the true cut-off levels may be even lower than those previously reported [ 24].
We may be criticised for using arbitrary OR cut-offs to define strong and moderate association, but identifying the true cut-off for defining clinically meaningful OR values is impossible in a field that has few longitudinal studies to consult.
We divided the included audit data into three age groups for several reasons: the discrepant definitions of old age in the literature; our opinion that 65 years is not a true cut-off mark for old age and the biological differences found with increasing age.
Her brothers protested to Emperor Michael II, and the Byzantine ruler ordered the island's strategos, Constantine Soudas, to investigate the matter and if the charges were found true, to cut off Euphemius' nose as punishment.
True, Putin could cut off Ukraine's energy supplies.
The more we cut off true debate and the exchange of ideas, and let those in power use emotion, misdirection, and the manipulation of truth to whip the nation into action, the more likely we are to make dangerous mistakes in how we use our power.
And it is partly true--Hurricane Katrina cut off both access to oil and caused refineries to shut down, causing a gasoline price spike.
Bush is the one true believer, a man essentially cut off from all information except the official line".
True, the new administration has cut off funds for international agencies that sponsor abortion; but in announcing that he will not seek to overturn laws guaranteeing freedom of choice, President Bush - a subtle and not easily deciphered politician - has shown that he understands the political risks of moral absolutism better than his Tory disciples in Britain.
But any measure of the war's dead, including some 20,000 Afghan civilians and perhaps 100,000 Iraqi civilians, will necessarily fall far short of the true cost of young lives cut off, of grieving families, of children without a parent.
