. Author manuscript; available in PMC: 2012 Apr 16.

Published in final edited form as: J Consult Clin Psychol. 2010 Oct;78(5):691–704. doi: 10.1037/a0019552

Table 2.

Slope of Change Over Time

	Slope estimates			ES^a
Variable	CART (n = 21)	CT (n = 20)	Slope differences	CART (n = 21)	CT (n = 20)
PCO₂	1.02^**	0.35	–0.66^*	0.97	0.34
RR	–0.89^**	0.47	1.36^**	0.80	0.42
ASI/BSQ	–0.30^**	–0.30^**	–0.00	0.74	0.75
ACQ	2.17^*	2.02^*	–0.15	0.66	0.61
PDSS	–0.72^**	–0.95^**	–0.24	2.68	2.25

Note. Raw scores were used for these analyses (except for the ASI/BSQ). Slope estimates represent the change per week within a group. Slope differences represent differences in changes over time between groups. CART = capnometry-assisted respiratory training; CT = cognitive skills training; PCO₂ = partial pressure of carbon dioxide; RR = respiration rate; ASI/BSQ = composite of z-scored Anxiety Sensitivity Index and Body Sensations Questionnaire; ACQ = Anxiety Control Questionnaire; PDSS = Panic Disorder Severity Scale.

We calculated the standardized effect size for the linear change over time within each treatment group. This effect size is Cohen's standardized effect size (d) extended to clustered data (Raudenbush & Liu, 2001).

p ≤ .05.

^**

p < .01.