correlational
Men who worked nights for many years might have slightly lower red blood cell counts than men who worked nights briefly, while women show the opposite — but all numbers are still normal and not a health concern.
Evidence from Studies
No evidence studies found yet.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.