Irrespective of the numerical data, decide whether the assumption of a fixed effect model is plausible. Could the studies all be estimating the same effect? If not, consider a random effects model....

Irrespective of the numerical data, decide whether the assumption of a fixed effect model is plausible. Could the studies all be estimating the same effect? If not, consider a random effects model.

They reported that some ceiling effects were found for the dimension ‘burden’ (34%). What might a ceiling effect mean for a subscale? Is it a problem and what could be done about it if it is?