Or in other words it means that in theory in 95 out of 100 trials we can be confident that the result will lie somewhere along the horizontal confidence interval lines. In this situation, the result would be recorded as inconclusive or of uncertain benefit. The result that you read from the odds-ratio diagram should agree with the textual results and implications given in the main body of the review. The visual appreciation of the results of a review would be the first step only in using the results of any review to guide a health care decision. Some meta-analysis diagrams include weighted means difference results, which is just a different statistical technique used to deal with different types of outcome.
Outcomes can either be discrete or continuous.
There is no in-between with dichotomous outcomes, they either happen or they don't. These outcomes can be compared using an odds-ratio. Other outcomes are measured on a continuous scale, e.g. blood loss, length of hospital stay, height, etc. Continuous outcomes cannot be compared using odds-ratio as a statistical method. Instead weighted means difference is used.