The narrower the confidence interval, the more precise the relative risk estimate.

Questionnaires can be completed in a matter of minutes, and for each disease, the site offers both a visual and verbal risk estimate as well as personalized tips for prevention.

The companies are giving the same individuals widely different risk estimates for some diseases because of uncertainty about how widespread the conditions are in the general population.

Confidence intervals are computed to demonstrate the precision of relative risk estimates.

Risk estimates made from data provided by analog studies have certain limitations for long duration missions.