. Author manuscript; available in PMC: 2015 Feb 1.

Published in final edited form as: J Dev Behav Pediatr. 2014 Feb-Mar;35(2):100–107. doi: 10.1097/DBP.0000000000000025

Table 3.

Standardized coefficients for direct and indirect effects of assignment to methylphenidate on change in math productivity for each of the three mediator models

Tested Mediator	Direct Effect	Indirect Effect
Tested Mediator	Estimate (test of estimate)	Estimate (test of estimate)
Change in % time on-task	0.19^* (1.97)	0.15^** (2.79)
Change in GNG¹ accuracy	0.29^** (2.91)	0.05 (1.38)
Change in GNG¹ RTSD²	0.30^** (3.00)	0.04 (1.03)

^**

p < .01,

p < .05

GNG = Go/No-Go

RTSD = reaction time standard deviation