correlational
Taking 3 grams of glycine before bed might make people feel less sleepy during the day, based on how they report their sleepiness.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with reduced daytime sleepiness in individuals with chronic sleep dissatisfaction, as measured by subjective assessments.
Original Statement
“Glycine lessened daytime sleepiness and improved performance of memory recognition tasks.”
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The study design (cohort study) cannot establish causation, but the abstract uses 'lessened' which implies causation. The correct verb strength should be 'associated with reduced' or 'linked to lower'.
Evidence from Studies
No evidence studies found yet.