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. Author manuscript; available in PMC: 2018 Nov 21.
Published in final edited form as: J Learn Disabil. 2018 May 21;51(6):612–624. doi: 10.1177/0022219418775110

Table 3.

Effect Size by Categorical Variables.

Variable Coefficient SE 95% CI p df I2 τ2 n k
Hours of treatment
 63 or less 0.33 0.07 0.17, 0.50 .001 11 25.74 .07 167 12
 More than 63 0.45 0.05 0.34, 0.56 <.001 9  0 0 145 12
Group size
 Small group 0.33 0.05 0.23, 0.43 <.001 15  2.92 .01 220 17
 One-on-one 0.59 0.06 0.45, 0.73 <.001 10  0 0 108 8

Note. k = number of studies; n = number of effect sizes.