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Sometimes, we spot stuff that predicts how things will happen. Well, usually happen. These may be described as ‘risk’ factors—that is, factors which predict something will happen—or ‘prognostic’ factors—things that predict the outcome of a condition. There are a range of generalisations that are sometimes made from ‘predictive’ studies, and if you take an extremely non-medical example you may spot some …
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.