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Table 1 Completion time for each of the three Stroop cards in seconds (standard deviations in brackets), separate for first and second born twins (sample size is given in brackets).

From: Heritability of Stroop and flanker performance in 12-year old children

Card type

first born twins (141)

second born twins (140)

Card 1

52.0 (8.2)

51.0 (7.7)

Card 2

71.0 (11.8)

69.1 (11.3)

Card 3

117.5 (22.9)

117.2 (24.6)

Interference score (3 minus 2)

46.5 (16.6)

48.2 (17.3)