However, the efficacy of saw palmetto as a hair loss treatment is up for debate; according to the National Institutes of Health, there's not enough evidence to show for sure that it helps.
While there is no known scientific literature linking cancer of the nasal cavity to the use of nasal snuff, there is not enough evidence to know for sure what all the risks of nasal snuff are and how they compare to cigarette smoking.
Setting aside the rigour of the evidence (for instance, how sure am I my stone is really blue and came from that bag?), Bayes' theorem acknowledges that even if you have good evidence, the impact it has on your belief – perhaps better expressed as the credibility you place on any given theory – will depend on your prior assessment of the theories involved.
Without robust quantitative evidence, do we know for sure that the balance of funding between new build and adaptations for existing homes outlined in the white paper is correct?
There's too much rhetoric here, and too little evidence of tangible action, for sure.
There is not enough evidence for scientists to know for sure whether the influx of fresh water in the North Atlantic has come from an already altered ocean circulation, changes in rainfall patterns or rivers, or glacial and Arctic Ocean ice.
Nobody knows for sure, but evidence suggests most of the discarded components are dumped locally, despite the substantial risk that the waste, laden with toxic lead, mercury and cadmium, will contaminate local soil and water supplies.
Furthermore, this is of importance because it has been presumed that there may be a time point beyond which disc degeneration will become irreversible [ 24, 25], T2 mapping may provide evidence for us to make sure therapeutic interventions are taken at the early stage before the onset of the degenerative cascade which might no longer be retarded once initiated [ 21].
It is hard to tell for sure, but such evidence as looks reliable is hardly encouraging.
"-...I know for sure that the evidence tables have made it easier for me, because I've based a lot of my work on the tables and these were graded.
