In meta-analysis 3RCTs, why does the Cochrane h'book ref 17.7 discourage using means difference?

In meta-analysis 3RCTs, unlucky random baseline(+SD) & end(+SD) PRO psychometric scores. Cochrane h'book ref 17.7 discourages using means difference? Non-significant result when outcome...

06 June 2015 3,201 3 View