Odds ratio (OR)

The odds ratio says by what factor the odds of the event change when the predictor rises by one. 1 means no relationship. Above 1: the odds rise; below 1: they fall. The 95% CI shows the plausible range (here the Wald interval).

Example: OR = 1.05 per concentration point, 95% CI [1.02, 1.09]: with each additional point the odds rise by about 5%. The range does not include 1.

Caution: An odds ratio is not "x times as likely" - that holds only for rare events. If 1 lies within the range, there is no clear evidence of a relationship.