Table 7: Illness Severity Versus Cognitive Performance. Scores are the Group Means with s.e.m in Parenthesis. Higher Stroop and RT Scores=Slower Reaction Times

Stroop (sec) Free Recall (words) Simple Reaction Time (msec) Repeated Digits Task (digits)
Low Illness Severity:
CFS
Controls
Medium Illness Severity:
CFS
Controls
High Illness Severity:
CFS
98.32 (4.04)
88.31 (2.94)

99.185 (4.18)
92.07 (11.25)

120.62 (2.40)
6.70 (0.24)
7.04 (0.20)

6.23 (0.24)
6.87 (0.63)

6.21 (0.16)
387.23 (29.07)
315.00 (21.35)

466.73 (29.33)
325.41 (78.21)

516.30 (17.72)
11.98 (0.51)
13.11 (0.41)

11.38 (0.54)
12.52 (1.41)

11.21 (0.33)
Group Effect: F(4,411)=19.78, p<0.000 F(4,404)=2.64, p<0.034 F(4,404)=13.32, p<0.000 F(4,405)=2.94, p<0.020