Contents of It's not All in Your Head by Asmundson and Taylor

Independent samples t tests were used to analyze differences between the SHB and WLC
groups. Only p values less than .05 were considered statistically significant.
Power analyses were conducted using the Power and Sample Size Calculation
program (Dupont & Plummer, 2009) to determine if there was sufficient power to justify
conclusions based on the small sample; .80 is commonly used as the minimum acceptable
level of power (Cohen, 1988). All power analyses were conducted for p = .05, 2-tailed
tests of significance. Effect size (Cohen‘s d) was also calculated for each measure using
the Effect Size Calculator (Becker, 1999); effect sizes were rated as small (d = 0.20),
medium (d = 0.50), and large (d = 0.80; Cohen 1988). A clinically significant treatment is
one that brings an individual from the dysfunctional population (i.e., health anxiety
population) into the functional population (Jacobson & Truax, 1991). Results were
assessed for clinical significance and means that were brought within two standard
deviations (M ± [2 x SD]) of the healthy normative sample mean were considered to be
clinically significant (Jacobson & Truax, 1991). Open-ended questions were analyzed to
identify common themes using deductive content analysis (Elo & Kyngäs, 2007).
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