Table 3.

Effect Sizes of Group Differences in Improvement

Test	Post CBT (1)	Four month follow-up (2)	Eight month follow-up (2)
SF-36 Mental Composite	.64*	.70*	.80*
SF-36 Physical Composite	.08	.71*	1.0**
MPQ Pain Now	.57*	.72*	1.2***
MPQ Pain Typical	.11	.90*	.92*
CSQ Ability to Control Pain	.05	1.1**	1.2***
CSQ Ability to Decrease Pain	.31	1.1**	.94*
CSQ Catastrophizing	.44	.72*	.60*
CSQ Divert Attention	.23	.23	.64*
CSQ Reinterpret Pain	.19	.15	.03
CSQ Self Talk	.21	.37	.37
CSQ Ignore Sensations	.06	.12	.13
CSQ Pray/Hope	.19	.52	.37
CSQ More Active	.07	.03	.37
TOPS Total Pain Experience	.26	1.3***	1.3***
• Pain Symptoms	.33	1.1**	1.3***
• Lower Body Limitations	.31	.74*	.65*
• Perceived Social Disability	0.7	1.0**	.98*
• Objective Social Disability	.44	.76*	.70*
• Objective Work Disability†	.53	.51	.36

⁽¹⁾Post CBT group means were compared after adjusting for baseline scores. Group differences were not expected to be different.

⁽²⁾Group means were compared after adjusting for post-CBT scores and responsiveness to CBT treatment (difference score: Post-CBT score – baseline).

^†Dichotomous outcome. Fisher’s exact test used for group comparison of actual counts (no adjustment for prior scores). Cohen’s effect size index h is reported.

Significance

^*p<.05,

^**p<.001,

^***p<.0001 Where significant, TIVR group showed more improvement