Table 2. Descriptive statistics according to different sub-groups of variables: Relative Age Effect, Socio-economic status, and Type of Institution, ANOVA results (one way) and post hoc analysis (all the comparisons post hoc presented are statistical significant).

Relative Age Effect (RAE)
SIMCEvariable	ANOVAF (p-value)	Subgroups	N	Mean	SD	SE	95% CI Lower limit	95% CI Upper limit	Post hoc (Tamhane)
GAP	F = 23.24 p < .001	G1	1523	262.55	45.83	1.17	260.25	264.85	1 < 2** > 5**
		G2	3929	267.09	43.19	0.69	265.74	268.44	2 > 1, 3, 4, 5 **
		G3	3827	263.36	43.03	0.70	261.99	264.72	3 < 2** > 4, 5**
		G4	3490	260.42	41.54	0.70	259.04	261.80	4 < 2, 3 ** > 5 *
		G5	2465	257.24	40.49	0.82	255.64	258.84	5 < 1, 2, 3, 4 **
Socio-economic Status (SES)
GAP	F = 955.87 p < .001	Low	1529	240.08	35.59	0.94	238.25	241.92	1 < 2, 3, 4, 5 **
		M-Low	4658	246.63	38.83	0.57	245.52	247.75	2 > 1 < 3, 4, 5 **
		Medium	5481	262.63	38.73	0.52	261.60	263.65	3 > 2, 1 < 4, 5 **
		M-High	2265	285.63	38.01	0.80	284.06	287.19	4 > 3, 2, 1 < 5 **
		High	1301	305.76	36.13	1.00	303.79	307.72	5 > 4, 3, 2, 1 **
Type of Institution
GAP	F = 1372.85p < .001	Public	6561	246.91	38.76	0.48	245.97	247.84	1 < 2, 3 **
		Subsidized	7517	269.41	40.38	0.47	268.50	270.32	2 > 1 < 3 **
		Private	1156	307.08	35.78	1.05	305.02	309.15	3 > 2, 1 **

Note: SD = Standard Deviation; SE = Standard Error of the mean; CI = Confidence Interval of the mean; GAP = Global academic performance score;

*p < .05;

**p < .01.