descriptive
Analysis v1
Strong Support
For healthy Korean men between 19 and 40, one standard range works for IGFBP-3 blood levels, but IGF-1 levels change as you get older, so you need different ranges for different ages.
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Evidence from Studies
Supporting (1)
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Community contributions welcome
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This study found that in young Korean men, IGFBP-3 levels stay about the same no matter their age between 19 and 40, so one normal range works for everyone. But IGF-1 levels go down as men get older, so each age group needs its own normal range.
Contradicting (0)
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Community contributions welcome
No contradicting evidence found
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.