TABLE 3.

Effect size(s) in included studies

First Author, Year	Number of Implants	Type(s) of Analysis	Effect Size	Authors’ Conclusion
De Seta 2016	26	Pearson's correlation	NR	No correlation
Hilly 2016	120	Spearman's correlation	R = 0.16, p = 0.09	No correlation
Holden 2013	114	Spearman's correlation	NR	No correlation
Marrinan 2004	28	Linear regression	NR	No correlation
O’Connell 2016	137	Pearson's correlation	CNC: r = 0.23, p = 0.006	Significant positive correlation between angular insertion depth and CNC word scores.
	107		AzBio: NR	No correlation
	137	Multivariate linear regression	CNC: coefficient 0.0006, 95% CI 0.0002–0.001, p = 0.009	CNC word score increases 0.6% with every 10 degrees increase in angular insertion depth.
Van der Beek 2005	45	Pearson's correlation	R = 0.01, p > 0.8	No correlation
Van der Marel 2015	162	Multivariate partial correlation	R = 0.03, p = 0.69	No correlation