Table 5.

 Clustering between doctors for primary outcomes in patients (intraclass correlation coefficient measured at end point)

	Intraclass correlation coefficient			Variance
	Unadjusted	Adjusted		Between doctors	Within doctors
Beck depression inventory	0.11	0.013		0.5	41.4
State anxiety	<0.001	<0.001		<0.001	86.7
Trait anxiety	0.033	<0.001		<0.001	66.8
SF-36 dimensions:
Role limitations (emotional)	0.12	0.11		59.0	469.0
Social function	0.090	0.067		24.2	334.8
Mental health	0.063	0.010		2.1	207.2
Energy and vitality	<0.001	<0.001		<0.001	252.8