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

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subscale (n = 5); T1 M = 16.80 (SD = 8.32) <strong>and</strong> T3 M = 16.80 (SD = 4.00). Power<br />

analyses <strong>in</strong>dicated that the differences between the T1 <strong>and</strong> T3 means were too small to<br />

draw any conclusions (m<strong>in</strong>imal detectable BAI difference = 22.26; m<strong>in</strong>imal detectable<br />

DASS21 anxiety subscale difference = 11.17) <strong>and</strong> it was unlikely that a t test would<br />

detect significant differences. This was because either the sample was too small or the<br />

treatment did <strong>not</strong> affect general anxiety (BAI d = 2.08 [large effect], power = .43 [low<br />

power]; Dass21anxiety subscale d = -1.70 [small effect], power = .08 [low power].<br />

Therefore, no further analyses were conducted with the BAI or DASS21 anxiety<br />

subscale.<br />

An <strong>in</strong>terest<strong>in</strong>g f<strong>in</strong>d<strong>in</strong>g was that participants <strong>in</strong> the SHB group were already<br />

show<strong>in</strong>g reductions <strong>in</strong> health anxiety symptoms <strong>and</strong> depression <strong>by</strong> mid-treatment (see<br />

Table 4). SHAI scores showed a significant reduction (t = 2.11, df = 9, p = .032; power =<br />

.44 [low power]). There were significant reductions on the MIHT behaviour (t = 2.24, df<br />

= 9, p = .026; power = .49 [low power]) <strong>and</strong> perception subscales (t = 2.53, df = 9, p =<br />

.032; power = .60 [low power]). There was also a significant reduction on the CES-D (t<br />

= 2.05, df = 9, p = .035; power = .42 [low power]). The effect size was large on the SHAI<br />

(d = 0.88) <strong>and</strong> MIHT behaviour (d = 0.80) <strong>and</strong> perception (d = 1.03) subscales; medium<br />

on the MIHT affect subscale (d = 0.71), CES-D (d = 0.56), <strong>and</strong> PCS (d = 0.51); <strong>and</strong> small<br />

on the MIHT cognition subscale (d = 0.37) <strong>and</strong> MCS (d = 0.17). By the mid-po<strong>in</strong>t <strong>in</strong><br />

58

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