They hypothesized that frequent and dependent cannabis use in youth would be associated with IQ decline, then did a review and meta-analysis of other studies to prove their point:
We identified 2875 papers and conference abstracts for screening after removal of duplicates. We identified 33 papers for full-text screening. We included seven studies that met our criteria.
So, from all the 2875 sources they found, they selected the 7 that together could prove that their hypothesis was right.
They hypothesized that frequent and dependent cannabis use in youth would be associated with IQ decline, then did a review and meta-analysis of other studies to prove their point:
> We identified 2875 papers and conference abstracts for screening after removal of duplicates. We identified 33 papers for full-text screening. We included seven studies that met our criteria.
So, from all the 2875 sources they found, they selected the 7 that together could prove that their hypothesis was right.
https://www.cambridge.org/core/journals/psychological-medicine/article/intelligence-quotient-decline-following-frequent-or-dependent-cannabis-use-in-youth-a-systematic-review-and-metaanalysis-of-longitudinal-studies/26BEC9CBD2A39010C26100278F8CA813
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