Table 2. Interclass correlation for the inter and intra-examiner repeated readings.

	Co-ordinate	Mean (mm)	S.D. (mm)	Error Mean (mm)	r-value p-value
Inter-examiner	x	0.02	0.2	0.03	0.63 0.003
	y	0.01	0.17	0.03	0.90 0.001
	z	-0.09	0.7	0.12	0.99 0.001
Intra-examiner	x	-0.04	0.76	0.13	0.99 0.001
	y	0.14	0.32	0.06	0.99 0.001
	z	0.14	0.32	0.06	1.00 0.001