Grouped by publication time, the combined OR of the 8 studies published before 2010 was 1.19 (95% CI: 0.94–1.52, P = 0.1305), which did not reach statistical significance, and the heterogeneity was low (I2=8.3%), indicating that the results of early studies were more consistent, but the statistical evidence was limited.
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Serum insulin-like growth factor-1 and epidemiological evidence of the risk of prostate cancer.
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