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Table 1 Test-retest reliability results

From: Testing assumptions for endophenotype studies in ADHD: Reliability and validity of tasks in a general population sample

Measure

inter-class r

partial ra

intra-class r

time 1

time 2

t-value

df

p

    

mean

SD

mean

SD

   

Fast Task (n = 41)

baseline (all trials)

   mean RT

.85

.75

.77

730.31

177.76

659.24

156.71

4.89

40

<.001

   SD of RTs

.60

.53

.58

193.77

103.55

171.86

118.49

1.40

40

.17

baseline (30 trials)

   mean RT

.76

.53

.68

670.64

155.09

603.32

138.74

3.75

40

.001

   SD of RTs

.47

.37

.43

155.78

68.90

141.59

97.80

0.93

40

.36

fast-incentive

   mean RT

.89

.79

.82

537.69

121.55

499.78

100.97

4.29

40

<.001

   SD of RTs

.76

.65

.70

122.80

50.63

105.34

47.43

3.25

40

.002

Go/No-Go (n = 44–47)

slow condition

   mean RT

.76

.63

.74

512.00

105.13

532.07

112.06

-1.77

44

.08

   SD of RTs

.58

.53

.58

177.51

115.86

172.33

123.30

.315

44

.75

   commission errors

.56

.56

.53

45.19

23.18

36.59

22.46

2.69

44

.01

fast condition

   mean RT

.88

.85

.87

387.20

74.69

385.24

64.58

0.37

44

.71

   SD of RTs

.83

.82

.83

147.42

69.48

147.02

65.80

0.07

44

.95

   commission errors

.70

.67

.64

42.54

16.99

38.62

17.89

1.93

44

.06

incentive condition

   mean RT

.70

.63

.69

508.64

91.44

526.48

79.26

-1.77

43

.08

   SD of RTs

.26b

.09b

.26

119.52

47.43

122.91

40.47

-0.42

43

.68

   commission errors

.54

.47

.52

25.95

16.30

21.82

16.97

1.72

43

.09

  1. a controlling for age b inter-class r increases to .61 and partial r to .44, if exclude six potential outliers (see text for further information)