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. Author manuscript; available in PMC: 2012 Jun 12.
Published in final edited form as: J Consult Clin Psychol. 2009 Jun;77(3):580–587. doi: 10.1037/a0014486

Table 4.

Mean Scores and Standard Deviations on Anxiety Measures and Analyses of Covariance Results for Program Effects

Group
CAPS WL
Measure M SD M SD t p Cohen’s d
ADIS–C/P CSR
    Preintervention 2.10 0.85 2.15 0.67
    Postintervention 1.65 1.00 2.05 1.85 −1.00   .32 0.34
    6-month follow-up 1.47 0.74 2.56 1.54 −2.82   .01 1.03
    12-month follow-up 0.94 0.85 3.24 1.56 −4.78   .001 1.99
SCARED, child
    Preintervention 24.70 14.61 24.39 10.24
    Postintervention 19.32 12.16 19.43 12.18 −0.10   .92 0.03
    6-month follow-up 17.39 10.50 16.60 9.79 0.18 1.0 0.00
    12-month follow-up 17.28 11.80 19.16 9.62 −0.58   .57 0.27
SCARED, parent
    Preintervention 15.23 7.97 18.52 11.89
    Postintervention 13.10 9.05 15.88 9.69 −0.29   .77 0.11
    6-month follow-up 9.46 8.33 13.61 10.15 −0.74   .47 0.36
    12-month follow-up 8.74 9.31 17.70 11.03 −2.02   .05 0.82

Note. CAPS = Coping and Promoting Strength program group; WL = wait list group; ADIS–C/P CSR = Anxiety Disorders Interview Schedule for DSM–IV—Child Version clinical severity rating; SCARED = Screen for Child Anxiety Related Emotional Disorders. Following Rosenthal’s (1994) suggestion, Cohen’s d can be calculated as d=t(n1+n2)/(df)(n1n2), where n1 and n2 are the sample sizes for the program and self-study groups, respectively. For mixed models for longitudinal data, the degree of freedom is based on Satterthwaite’s approximation that accounts for random effects in calculating standard errors (see Little, Miliken, Stroup, & Wolfinger, 1996). When the means are in the wrong direction, p = 1.0 and d = 0.