Copyright information:Taken from "Meta-analysis of the literature on diagnostic accuracy of SPECT in parkinsonian syndromes"http://www.biomedcentral.com/1471-2377/7/27BMC Neurology 2007;7():27-27.Published online 1 Sep 2007PMCID:PMC2064928. normalcy. Presynaptic radiotracer [33, 40-44]. # all studies have a specificity of 100% so the pooled odds ratio should therefore be infinite. The odds ratio of 60 is caused by STATA software's procedure for handling zero cells in the 2 × 2 table. abnormal SPECT definition: > 2 standard deviations below the bindingrate of healthy controls. outcome: sensitivity, specificity, odds ratio 95% confidence interval. surface square is based on the weight of the study. n = numbers of subjects. FP-CIT: Iodine-123-Ioflupane. TRODAT: 99mCT-TRODAT-1.