Clinical significance

Clinical significance addresses the question that statistics alone cannot answer: is this difference big enough to be worth caring about? A result can be statistically significant yet clinically trivial, or clinically meaningful yet statistically uncertain in a small study. Researchers sometimes define a minimal clinically important difference, the smallest change that a patient would notice or value, and compare the observed effect against it. When reading a study, look for whether the authors report the size of the effect in units that connect to daily life, and whether that size crosses a threshold of real-world relevance. For example, a pain drug that lowers scores by 2 points on a 100-point scale might reach statistical significance in a large trial while falling well short of the roughly 10-point change most people can actually perceive. Judging clinical significance means weighing the benefit against burdens, costs, and side effects, all of which vary by situation.