Moderator Variables
In the current meta-analysis, a detailed coding system was employed in order to examine the potential effects of psychophysical task type and stimuli presentation methods, clinical characteristics, medication status, and general demographics. The following psychophysical olfactory task and stimuli presentation method moderator variables were coded: (1) psychophysical task type (ie, odor identification, detection threshold sensitivity, discrimination, memory, and hedonics), (2) stimuli presentation method (ie, birhinal and unirhinal assessment), and (3) lateralized testing results (ie, left vs right nostril performance in unirhinal studies).