Working memory tasks MS patients Controls Mann-Whitney
Non-specific tasks      
  n=115 n=30  
PASAT score 40.12 (11.9) 49.5 (10.04) U=895.5, p<.0001
PASAT % 66.76 (19.79) 82.48 (16.73) U=884, p<.0001
  n=127 n=30  
Digit span (standard scores, WAIS-R) 9.47 (2.83) 11.4 (3.17)  
Digit forward span 5.94 (1.13) 6.43 (1.1) U=1484.5, p>.05
Digit backward span 4.42 (1.28)           5.23 (1.33) U=1657.5, p>.05
Articulatory rehearsal component      
  n=126 n=30  
Short-word span (1 syllable words) 4.56 (0.84) 5.23 (0.97) U=1184.5, p=.0008
Long-word span (4 syllables words) 3.8 (0.68) 4.27 (0.78) U=1263, p=.002
  n=100 n=28  
Phonological store component      
  n=126 n=30  
Dissimilar-letter span 4.59 (0.9) 5.4 (0.93) U=1026, p<.0001
Similar-letter span 4.64 (1.03) 5.16 (1.08) U=1377.5, p=.02
  Dynamic component      
  n=126 n=30  
Corsi forward span 5.52 (0.97) 6.23 (1.04) U=1193.5, p=.0009
Corsi backward span 4.98 (0.94) 5.6 (0.77) U=1198.5, p=.001
Visual component      
  n=125 n=30  
Pattern span 7.52 (1.56) 8.2 (1.63) U=1449, p>.05
Central executive component      
a span test n=126 n=30  
Initial word span 4.49 (0.72) 4.93 (0.83) U=1307.5, p=.004
Serial recall 9.06 (1.42) 9.47 (0.68) U=1737, p>.05
Alphabetical recall 7.08 (2.75) 8.1 (2.04) U=1428.5, p>.05
Manipulation score -23.2 (27.72) -14.52 (20.64) U=1461, p>.05  
Stroop test n=116 n=30  
Reading: raw time 47.46 (9.87) 41.97 (7.42) U=1181, p=.002
Naming: raw time 69.62 (15.02) 61.33 (10.98) U=1172.5, p=.002
Interference: raw time 124.49 (50.91) 100.1 (20.27) U=1134.5, p=.002
Flexibility: raw time 140.76 (49.67) 113.97 (23.82) U=1071, p=.001
Naming score 16.98 (19.15) 14.26 (10.83) U=1777.5, p>.05
Interference score 75.27 (58.01) 63.85 (23.23) U=1748, p>.05
Flexibility score 4.49 (0.72) 4.93 (0.83) U=1682, p>.05
  Reading: corrected-errors   0.22 (0.61)   0.1 (0.4)   U=1699.5, p>.05
Naming: corrected-errors 0.69 (1.06) 0.57 (0.82) U=1778, p>.05
Interference: corrected-errors 1.67 (2.15) 1.2 (1.45) U=1609.5, p>.05
Flexibility: corrected-color-errors 1.82 (2.21) 1.3 (1.39) U=1596, p>.05
Flexibility: corrected-word-errors 1.37 (3.13) 0.37 (0.61) U=1537.5, p>.05
  Reading: non-corrected-errors   0.11 (0.36)   0.03 (0.18)   U=1740.5, p>.05
Naming: non-corrected-errors 0.23 (0.77) 0.1 (0.31) U=1780.5, p>.05
Interference: non-corrected-errors 0.73 (1.39) 0.3 (0.6) U=1558, p>.05
Flexibility: non-corrected-color-errors 0.34 (0.75) 0.1 (0.31) U=1365.5, p>.05
Flexibility: non-corrected-word-errors 0.17 (0.58) 0.07 (0.25) U=1671, p>.05
Table 2: Working memory performances of both groups.