correlational
Taking 3 grams of glycine before bed might make people feel less sleepy during the day, according to how they report feeling.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with reduced daytime sleepiness in individuals with chronic unsatisfactory sleep, as measured by subjective assessments.
Original Statement
“Effects on daytime sleepiness and daytime cognitive function were also evaluated. 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 cannot establish causation, but the abstract uses 'lessened' which implies causation. The correct verb strength should be 'associated with' rather than 'lessened'.
Evidence from Studies
No evidence studies found yet.