correlational
Taking 3 grams of glycine before bed might help people fall asleep faster, according to sleep monitoring equipment.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with reduced sleep onset latency in individuals with chronic unsatisfactory sleep, as measured by polysomnography.
Original Statement
“Glycine improved subjective sleep quality and sleep efficacy (sleep time/in-bed time), and shortened PSG latency both to sleep onset and to slow wave sleep without changes in the sleep architecture.”
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 'shortened' which implies causation. The correct verb strength should be 'associated with' rather than 'shortened'.
Evidence from Studies
No evidence studies found yet.