Replicate Wells Did Not Expand the Delta-8 Airway Study Beyond Four Human Donors
The primary-airway experiments used cultures from four human donors with replicate wells. More wells and imaging fields improved within-donor measurement without creating more independent human donors.
The sampling hierarchy was explicit
The study used two replicate wells per donor and treatment, with multiple image areas assessed for ciliary activity. Measurements from replicate areas and wells were averaged for analysis. This structure distinguishes repeated observations from independent biological sources.
Donor differences affected the transcriptomic analysis
The researchers observed clustering by donor and included donor in the downstream models. That adjustment addresses a source of variation in the observed data. It does not establish that four donors encompass the full range of human airway susceptibility, including people with chronic lung disease or other exposure histories.
Precision and generalizability are separate questions
Replicates can make an estimate within a particular culture more stable. They cannot justify quoting the total number of wells, fields or RNA samples as the number of people studied. These were in-vitro exposures, not a clinical cohort. The experimental hierarchy matters when assessing the strength and limits of a cannabis-related respiratory claim: the number of measurements, the number of cultures and the number of donors answer different questions.
Related analysis: the source’s broader findings and limitations.
