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. 2013 May 8;38(10):2011–2018. doi: 10.1038/npp.2013.100

Table 2. Digit Span.

  Intake Placebo MPH Average
Forward 8.37 (1.92)a 9.32 (2.31) 9.79 (1.93) 9.16 (1.62)
Backward 7.58 (1.54)a 8.21 (2.1) 8.47 (1.74) 8.09 (1.57)
Total 15.95 (2.91)a,b 17.53 (3.73) 18.26 (3.14) 17.25 (2.84)

Abbreviation: MPH, methylphenidate.

a

Differs significantly (P<0.05) from the methylphenidate session.

b

Differs significantly (P<0.05) from the placebo session.

Values represent forward, backward, and total span scores (SD) averaged across all subjects (N=19) measured during intake, placebo, and methylphenidate session, and averaged across all measurements.