Table 2

Extent of disagreement by group design factors and clinical and social cues (lower values indicate closer consensus)

		Mean absolute deviation from the median (MADM)
		Round 1 mean	Round 2 mean	Round 2 difference(95% CI)	ANOVA* F test (p value)
*From the single ANOVA model without interaction terms (all design factor interactions p>0.05, all design factor:clinical and social cue interactions p>0.006).
Group design factors
Systematic literature review	Provided	1.32	1.15
Systematic literature review	Not provided	1.35	1.19	0.04 (−0.11 to 0.19)	F_1,12 = 0.31 (p = 0.59)

Group composition	GPs only	1.31	1.14
Group composition	GPs and MHPs	1.36	1.21	0.07 (−0.08 to 0.22)	F_1,12 = 0.89 (p = 0.36)

Healthcare resource context	Assumption of “realistic” context	1.31	1.14
Healthcare resource context	Assumption of “idealistic” context	1.37	1.20	0.06 (−0.09 to 0.20)	F_1,12 = 0.24 (p = 0.63)

Clinical and social cues
Depression	No co-existent depressive symptoms	1.35	1.21
Depression	Co-existent depressive symptoms	1.27	1.06	−0.15 (−0.24 to −0.07)

Organic cause	Patient willing to try any treatment	1.33	1.18
Organic cause	Patient believes condition has an organic cause	1.42	1.27	0.09 (0.01 to 0.18)
Financial motivation to return to work	No	1.31	1.20		F_7,105 = 7.26 (p<0.001)
Financial motivation to return to work	Yes	1.36	1.12	−0.08 (−0.19 to 0.03)

Back pain induced insomnia	No	1.30	1.11
Back pain induced insomnia	Yes	1.32	1.13	0.02 (−0.07 to 0.10)

Condition	Chronic back pain	1.31	1.13
	Irritable bowel syndrome	1.38	1.24	0.11 (0.01 to 0.21)	F_2,30 = 3.90 (p = 0.03)
	Chronic fatigue syndrome	1.34	1.16	0.03 (−0.05 to 0.12)

Treatment	Behavioural therapy	1.20	1.06
	Cognitive behavioural therapy	1.27	1.07	0.01 (−0.07 to 0.08)	F_3,45 = 18.89 (p<0.001)
	Brief psychodynamic interpersonal therapy	1.37	1.22	0.16 (0.09 to 0.23)
	Antidepressants	1.51	1.34	0.28 (0.21 to 0.34)