Table 5

Mean (SD) preoperative scores and 6 months postoperative change scores on neuropsychological tests. Descriptions of these tests can be found in Schmand et al13

Right pallidotomy (n=20)Left pallidotomy (n=9)
Preoperative scoreChange scorePreoperative scoreChange score
Boston naming test52.1  (8.1)−0.6  (2.5)52.4  (7.7)0.2  (2.8)
Category fluency37.1 (12.9)−2.8 (8.4)36.7 (7.7)−8.3 (4.6)5-160 5-151
Letter fluency COWAT33.1 (13.7)0.5 (5.8)34.3 (15.0)−7.6 (10.6)5-150
WAIS similarities (T)60.5 (15.4)−0.4 (6.7)57.6 (14.8)1.1 (5.9)
WAIS block design (T)46.3 (14.5)−1.3 (10.3)42.8 (11.2)−0.7 (7.3)
Bells test left 2 columns8.2 (2.0)−0.1 (1.9)9.1 (0.8)0.0 (1.0)
Bells test right 2 columns8.3 (1.7)0.1 (1.7)9.3 (1.1)−0.2 (1.0)
Bells test time (s)135 (54)4 (39)107 (29)37 (36)5-150 5-151
JOLO22.4 (7.1)−1.5 (5.5)25.0 (5.4)−1.0 (6.0)
Rey AVLT total36.8 (10.7)1.9 (7.7)36.4 (12.8)−0.7 (9.5)
Rey AVLT delayed recall7.1 (3.1)0.6 (2.2)8.2 (3.7)−0.6 (3.2)
Rey AVLT recognition27.9 (2.6)−1.0 (2.0)5-150 27.0 (3.7)0.6 (2.6)
Logical memory immediate5-153 8.1 (3.2)1.5 (3.8)8.0 (2.7)0.1 (3.6)
Logical memory delayed5-153 7.1 (2.8)1.5 (3.7)7.6 (2.8)−0.3 (2.9)
Recognition faces39.1 (6.4)0.0 (4.1)38.7 (6.5)−0.4 (3.7)
Trailmaking A (s)77 (75)0 (25)57 (21)8.8 (26)
Trailmaking B (s)164 (115)4 (51)161 (76)18 (59)
Stroop words (s)67 (61)−4 (11)5-160 55 (8)5 (6)5-152
Stroop colours (s)88 (109)0 (12)65 (13)9 (12)5-151
Stroop colour-words (s)154 (159)2 (29)143 (61)9 (48)
Stroop-Bohnen195 (198)15 (58)205 (60)−3 (63)
MWCST errors16.0 (9.1)0.0 (6.9)13.3 (7.3)3.9 (9.9)
MWCST perseverations5.8 (4.8)−1.6 (4.7)3.8 (2.9)2.0 (3.3)5-151
MWCST categories4.1 (1.7)−0.2 (1.3)3.6 (1.8)−0.6 (2.0)
  • 5-150 p<0.05;

  • 5-160 p<0.01 Wilcoxon signed ranks test of pre−post difference;

  • 5-151 p<0.05;

  • 5-152 p<0.01 Mann-WhitneyU test of group differences in change score.

  • Change score=6 months postoperative minus preoperative score;

  • 5-153 Logical memory of the Rivermead behavioural memory test; COWAT=controlled oral word association test; WAIS=Wechsler adult intelligence scale; JOLO=judgement of line orientation, age and sex corrected scores; AVLT=auditory verbal learning test; MWCST= modified Wisconsin card sorting test; T=age corrected T score.

  • Negative change scores indicate decline in performance except for MWCST errors, MWCST perseverations, and test variables expressed in seconds.