Table 2.

Mean ± SD of percentage initial and percentage post load RTL₂ and percentage difference between initial and post load RTL₂ for GI and GII (regarding the screw loosening)

% RTL 2		Groups						T-test
		Standard diameter			Narrow diameter			t	P value
Initial	Range	17.67	−	46.67	21	−	47.67	− 0.063	0.951
	Mean ± SD	33.301	±	11.894	33.633	±	11.763
Post load	Range	46.67	−	57.33	43.33	−	61	− 0.327	0.747
	Mean ± SD	51.966	±	3.120	52.666	±	6.009
Paired test	P value	0.002*			0.007*
% Difference	Range	9.37	−	190.57	3.65	−	165.08	− 0.056	0.956
	Mean ± SD	79.177	±	72.697	81.084	±	78.773

*Statistical significant