| http://www.w3.org/ns/prov#value | - age RR 0.74, 95% CI 0.61 to 0.89; 24 studies, 7693 women), (heterogeneity: Tau?? = 0.20, I?? = 98%, Chi?? test for heterogeneity P < 0.00001; prediction interval 0.29 to 1.91) ( Analysis 1.4), Again, there was some evidence that the treatment effect may be partly due to bias; sensitivity analysis including only those studies assessed as being at low risk of bias for allocation concealment showed t
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