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

Table 7
SHB and WLC effect size and power estimates
T1 - T2 Power T1 - T3 Power
Measure Effect size d 1 - β Effect size d 1 - β
SHAI 1.09 3 .78 2.43 3 MIHT
.78
Cognition 1.14 3 .78 1.27 3 .78
Behaviour 0.74 2 .40 0.94 3 .40
Perception 1.72 3 1.00 u 2.02 3 1.00
Affect 0.90 3 .47 0.93 3 .47
CES-D 0.68 2 .35 0.95 3 .35
SF-36
PCS 0.23 1 .08 0.01 1 .08
MCS 0.21 1 .09 0.46 1 .09
Note. SHB = self-help book group; WLC = wait-list control group; T = time; MIHT =
Multidimensional Inventory of Hypochondriacal Traits; SHAI = Short Health Anxiety Inventory;
CES-D = Centre for Epidemiologic Studies Depression Scale; SF-36 = Short Form 36 Health
Survey; PCS = Physical Component Summary; MCS = Mental Component Summary.
u Unequal variances assumed. 1 small effect; 2 medium effect; 3 large effect.
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