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Table 4 Two-way repeated measures analyses of variance to examine Quotient® attention variables for medication condition

From: Differentiating ADHD from oral language difficulties in children: role of movements and effects of stimulant medication

  Off medication (n = 16) On medication (n =16)     
  M (SD) M (SD)     
  T1 T2 T1 T2 Statistic Value p η 2
Accuracy 81.14 (13.81) 85.91 (12.09) 86.44 (12.40) 89.83 (6.30) Group F(1,15) 8.14 .01* .35
Omission errors 14.19 (14.49) 11.11 (15.11) 4.08 (5.88) 3.89 (5.37) Group F(1,15) 9.90 .01* .40
Commission errors 23.56 (16.27) 16.96 (13.33) 23.14 (19.74) 16.46 (8.94) Group F(1,15) .06 .81  
Variability 217.44 (81.27) 198.00 (88.15) 153.63 (76.77) 122.75 (55.26) Group F(1,15) 33.62 .00* .69
Latency 598.37 (105.77) 584.63 (89.17) 545.44 (81.50) 495.37 (80.31) Group F(1,15) 28.03 .00* .65
COV 35.50 (11.42) 32.25 (10.06) 27.13 (10.91) 23.69 (7.49) Group F(1,15) 32.28 .00* .68
  1. *Significant p-value alpha level of .01. η2 effect sizes of .01, 06, and .14 represent small, medium, and large effects sizes respectively.
  2. Accuracy: Percentage of correct responses to both target and non-target.
  3. Omission Errors: Percentage of missed targets.
  4. Commission Errors: Percentage of incorrect responses to non-target.
  5. Latency: Mean time, in milliseconds, to respond to target.
  6. Variability: Standard deviation of response time to target.
  7. Coefficient of Variance (COV): A more stringent measure of response consistency: (100 x variability)/latency.