Table 2.

Independent sample t-test to compare mean values between Age groups.

Variables	Age group	N	Mean	Std. Dev	t-Value	P-Value
A-NP	8–10 yrs	90	.124	3.3752	1.167	0.245
	11–12 yrs	60	−.510	3.0804
Co-Gn	8–10 yrs	90	105.232	14.8211	2.416	0.017*
	11–12 yrs	60	110.908	12.9332
Co-A	8–10 yrs	90	84.544	12.9043	2.205	0.029*
	11–12 yrs	60	88.972	10.6186
Max-Mand difference	8–10 yrs	90	21.124	4.7207	1.074	0.285
	11–12 yrs	60	21.942	4.3225
LAFH	8–10 yrs	90	57.638	8.6486	2.251	0.026*
	11–12 yrs	60	60.673	7.1719
Mandibular plane angle	8–10 yrs	90	25.668	4.4378	1.687	0.094
	11–12 yrs	60	26.950	4.7411
Facial axis angle	8–10 yrs	90	89.977	3.8035	0.304	0.761
	11–12 yrs	60	89.778	4.0684
Pog-NP	8–10 yrs	90	−4.412	6.0819	2.871	0.005*
	11–12 yrs	60	−7.130	5.0117
Is - A	8–10 yrs	90	5.843	2.9010	0.557	0.579
	11–12 yrs	60	5.592	2.3990
Ii to A-Pog	8–10 yrs	90	4.510	2.3568	0.004	0.996
	11–12 yrs	60	4.508	2.1181
Upper pharyngeal width	8–10 yrs	90	11.764	3.0691	1.584	0.115
	11–12 yrs	60	12.617	3.4524
Lower pharyngeal width	8–10 yrs	90	8.248	2.7309	3.099	0.002*
	11–12 yrs	60	9.627	2.5752

^*Independent Sample t-test- p < 0.05- Significant.