Table 1. Regression coefficients for relation of contrast-to-noise ratio to MAR, position and peak kilovoltage.

Reference (peripheral without MAR)		Regression coefficient (SE)
	Level (kVp=70)	19.03 (1.22) *
	Slope	0.34 (0.07) *
Factor	Effect
MAR	Change in level (kVp=70)	7.12 (1.41) *
	Change in slope	0.24 (0.10) ***
Central position	Change in level (kVp=70)	3.44 (1.41) ***
R2		0.89

MAR, metal artefact reduction; SE, standard error.

* p≤0.001.

** p≤0.01.

*** p≤0.05.