Table 2: Average quality indices and corresponding improvement ratios (± 1σ) of MLC 160 versus m3 systems.

Group	Index	m3	MLC-160	IR (%)	p-value
I (n = 36)	TC	0.98 ± 0.01	0.98 ± 0.01	-0.09 ± 0.54	0.279
	CI	0.72 ± 0.04	0.65 ± 0.04	-8.70 ± 4.78	< 0.001
	CN	0.70 ± 0.04	0.64 ± 0.04	-8.79 ± 4.69	< 0.001
	CGI	80.09 ± 2.36	77.23 ± 2.09	-3.55 ± 1.61	< 0.001
II (n = 16)	TC	0.98 ± 0.01	0.98 ± 0.01	-0.11 ± 0.46	0.234
	CI	0.73 ± 0.03	0.70 ± 0.03	-4.21 ± 3.38	0.001
	CN	0.72 ± 0.03	0.69 ± 0.03	-4.32 ± 3.38	0.001
	CGI	80.87 ± 2.35	79.91 ± 2.16	-1.18 ± 0.78	< 0.001
III (n = 15)	TC	0.95 ± 0.07	0.94 ± 0.08	-0.81 ± 1.99	0.169
	CI	0.70 ± 0.10	0.66 ± 0.10	-6.12 ± 7.43	0.003
	CN	0.66 ± 0.07	0.62 ± 0.07	-6.84 ± 7.95	0.003
	CGI	81.33 ± 9.93	78.87 ± 10.22	-3.05 ± 3.59	0.002
IV (n = 23)	TC	0.98 ± 0.08	0.97 ± 0.01	-0.91 ± 1.19	< 0.001
	CI	0.66 ± 0.08	0.59 ± 0.10	-11.11 ± 7.15	< 0.001
	CN	0.64 ± 0.08	0.57 ± 0.10	-11.91 ± 7.30	< 0.001
	CGI	75.90 ± 4.99	73.70 ± 5.75	-2.95 ± 2.57	< 0.001