114 PART THREE | DELIRIUM for participating in the study while recovering from delirium. Four DOS negative patients were included in the DOS positive group during a later hospital admission. These patients were excluded from the DOS negative group during the analyses. For one patient in each group all data were missing, leading to a total of 94 DOS negative and 93 DOS positive patients (Figure 1). The demographic and clinical characteristics are described in Table 1. The mean (SD) age was 68 (11) in the DOS positive group and 60 (13) in the DOS negative group (p< 0.001). Other characteristics obtained at baselinewere not significantly different between the groups. None of the patients in the DOS negative group were diagnosed with delirium. Eighty-eight of the patients in the DOS positive group were diagnosed with delirium, see Table 2. The sensitivity and specificity of the DOS were > 99.9% (95%CI: 95.8-100.0%) and 99.6% (95%CI: 95.5-100.0%) respectively, the NPV was 94.6 (95%CI: 88.0-97.7%), and the PPV was >99.9% (95%CI: 96.1-100.0%), see Table 3. Figure 1. Study flow chart. Abbreviations: DOS, delirium observation scale; DRS-R-98, Delirium Rating Scale Revised 98
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