For men, there was a nonsignificant trend towards reduced mean IGF-I levels with increasing smoking exposure ( P trend =0.11), but no association after adjustment for IGFBP-3.
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The effect of cigarette smoking use and cessation on serum insulin-like growth factors.
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The sentences
Mean IGFBP-3 levels in men who recently stopped smoking were lower than those in never smokers, but this did not reach statistical significance.