(+) CABG     (-) CABG     N=88 z 1 wk z 3 mo N=28 p Figure Reconstruction 20 ± 7 -1.9 -1.4 20 ± 7 0.96 Delayed Figure Reproduction 7 ± 3 -0.5 -0.2 7 ± 3 0.71 Immediate Story Recall 18 ± 5 -1.2 -1.5 17 ± 4 0.77 Delayed Story Recall 9 ± 3 -1.5 -1.6 8 ± 3 0.27 Immediate Word List Recall 26 ± 7 -2.1 -1.6 23 ± 5 0.09 Delayed Word List Recall 6 ± 3 -2.5 -1.7 5 ± 2 0.09 Digit Span 8 ± 2 -1.2 -1.5 8 ± 2 0.3 Semantic Fluency 16 ± 4 -0.5 -0.2 16 ± 4 0.69 Phonemic Fluency 12 ± 5 -0.6 -0.2 13 ± 5 0.2 Stroop 38 ± 12 -1.3 -0.8 38 ± 12 0.99 Data are expressed as mean±SD, z 1 wk: z-scores at 1 week, z 3 mo: z-scores at 3 months, p values between surgical and nonsurgical groups at baseline are from t-tests

Table 2: Baseline cognitive raw scores and z-scores at 1 week and 3 months after surgery.