FIGURE 3. Estimated values and 95% CI of sensitivity (A) and specificity (B) in different types of studies (type I, type II, type A, and type B) and in pooled data (global). Global = pooled data; type I = ¹⁸F-FDG PET was performed when all diagnostic procedures performed did not detect primary tumor; type II = ¹⁸F-FDG PET was compared with CT or MRI in double-blind study after negative results for primary tumor detection with other diagnostic procedures; type A = whole-body ¹⁸F-FDG PET study was performed; type B = ¹⁸F-FDG PET study only included head-neck-thorax region.