I am doing a systematic review on the risk factors that predict infection after liver and pancreatic surgery. These risk factors include parameters like age, sex, smoking, pre-operative chemo etc.
I have a number of studies but not all report their findings in the same way, so I am having trouble doing the meta-analysis. Some of the studies only report a p-value. Beyond simply counting the number of studies that have significant P-values for each risk factor, is there another way to derive an overall p-value for each risk factor?