Table 3.

Correlation between MP and CP class I, class III, and class III groups. Test statistic- spearman correlation test.

Categories	n	MP	CP	Difference in median values (mm)	Marginal difference in relation to MP %	Correlation coefficient ‘Sr’	‘P’ value
		Median (mm)	Median (mm)
Class I	n=60	121.96	122.20	0.24	0.19%	0.84	<0.001**
Class II	n=30	125.28	126.46	1.18	0.09%	0.52	0.003**s
Class III	n=10	120.55	118.09	-2.46	2.04%	0.49	0.15NS
Overall percentage error	n=100	122.64	124.13	1.49	1.21%	0.6809	<0.0001**

**p<0.01 -very Significant; *p<0.05 –Significant; p>0.05, NS- Non Significant.

MP -Measured arch perimeter: CP - Calculated perimeter. All measurements are in millimeters (mm).