The first published meta-analysis1 on olfactory dysfunction in schizophrenia was conducted in order to examine group differences in olfactory performance across various types of olfactory performance measures. Our prior results indicated comparable deficits for different psychophysical measures examined including odor detection threshold, discrimination, identification, and memory. In addition, olfactory impairment in schizophrenia was largely independent of sex, medication status, and smoking history. While the results of the previous meta-analysis addressed several unanswered questions concerning olfactory performance in schizophrenia, several limitations were also apparent. First, only 25 studies were available for analysis, with an overrepresentation of odor identification studies. In addition, the effects of several moderator variables could not be reliably assessed given the lack of presented data and appropriate meta-analytic tools available at the time of publication.