Browse the glossary:
-
N-of-1 trial see single participant trial
(single case design)
— A study in which different treatments are allocated at random to be taken at different times by one person; … (read more)
-
natural course of health problems
(natural history*, natural progression*)
— The course of a health condition (worsening or improving) without treatment; … (read more)
-
negative predictive value
(NPV)
— The proportion of people with a negative test result who do not have the disease or target condition of interest; … (read more)
-
nocebo effect
— Undesirable effect that is or could be caused by an inactive treatment, presumed to act psychologically through suggestion; … (read more)
-
non-random allocation
(quasi-random allocation)
— Methods of allocating study participants to treatment comparison groups that are not random, but are intended to produce similar groups.; … (read more)
-
non-randomized study
(non-experimental study, observational study,)
— A category of studies that does not use random allocation to assign participants to treatment comparison groups; … (read more)
-
number needed to harm
(NNH, NNTH)
— The number of people who would need to be treated over a specific period of time before one bad outcome of the treatment will occur; … (read more)
-
number needed to screen
(NNS, NNTS)
— The number of people who would need to be screened over a specific period of time before one good outcome of the screening will occur; … (read more)
-
number needed to treat
(NNT, NNTT)
— The number of people who would need to be treated over a specific period of time before one good outcome of the treatment will occur; … (read more)