3 ms·

I would assume that a well constructed study would account for this.

• hopia 7y ago
  Yes, I have to admit I haven't read the actual study so this was purely speculation.
• cosmotic 7y ago
  In my experience, studies are typically not well constructed. See the numerous studies that cannot be replicated, the below-the-surface iceberg of unpublished (unfavorable) studies paid for by for-profit institutions, or the shockingly small sample set or biased sample set in most studies. Most studies expose this information implicitly but it's up to the reader to determine the bias or replicate the study.
  • hwillis 7y ago
    The study compared people born after 1990, so if there were any old people in that cohort this study would be much bigger news.