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Table 2 Behavioral results

From: Impaired neural networks for approximate calculation in dyscalculic children: a functional MRI study

Conditions Number of trials, Mean (S.D.) 3rd grade children 6th grade children
  Control children Dyscalculic children Control children Dyscalculic children Control children Dyscalculic children
Approximate Calculation 72.8 (13.2) 70.2 (12.2)     
Reaction time (ms)       
   Mean (S.D.)    1659 (660) 1467 (523) 891 (352) 929 (351)
Accuracy rate (%)       
   Mean (S.D.)    79.5 (4.9) 68 (17.0) 89.5 (4.6) 86 (9.2)
Exact calculation 73.6 (16.1) 72.2 (14.0)     
Reaction time (ms)       
   Mean (S.D.)    1707 (763) 1499 (494) 768 (370) 872 (426)
Accuracy rate (%)       
   Mean (S.D.)    73.7 (8.2) 60 (17.2) 87.9 (8.3) 84 (10.2)
Magnitude comparison 127.3 (15.5) 121.5 (14.7)     
Reaction time (ms)       
   Mean (S.D.)    931 (254) 964 (288) 702 (176) 827 (189)
Accuracy rate (%)       
   Mean (S.D.)    97.2 (2.0) 95 (1.9) 96.7 (1.3) 97 (1.6)
  1. Means and standard deviations (SD) of the number of trials, reaction times and accuracy rates for 3rd grade and 6th grade children with or without DD during approximate or exact calculation and magnitude comparison are presented.