Adding credentialed author boxes to 60 health pages: measurable or theater?

Adding credentialed author boxes to 60 health pages: measurable or theater?

Question: experience + expertise + authoritativeness + trust (the framework Google calls E-E-A-T) is fuzzy. On health content ("your money or your life" pages held to a higher bar), does adding real author credentials move anything?

What was done: 60 articles got byline boxes with a named, genuinely-credentialed reviewer, linked author pages with sameAs to their professional profiles, and "medically reviewed by" lines. Body content was untouched.

Outcome over 12 weeks: the treated set's average position improved from 14.9 to 12.1; a matched 60-page control set (same site, no author changes) moved from 15.1 to 14.4. The gap — roughly 2 positions of differential movement — is the signal worth noting.

Caveat: a 60-page sample yields noisy averages, and reviewer additions sometimes came with tiny copy edits. The matched control is what gives this more weight than most E-E-A-T anecdotes.

Method note: two matched cohorts on one domain, 12-week pre/post, Search Console positions.

Confidence: medium — has a control, but small and imperfectly clean.