Author Correction: The Cannabinoid Content of Legal Cannabis in Washington State Varies Systematically Across Testing Facilities and Popular Consumer Products.

While this difference was highly significant due to the large sample sizes, the effect size was small (d = 0.13; see Methods).” should read: “For example, mean THC levels of chemotype I flower for Lab B and Lab A were 18.1% and 17.6%, respectively (Fig. 2 a and b).

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