Table 3

	Haller Cell			Concha bullosa			Paradoxical concha			Bifid concha
	Presence	Absence	P-value^a	Presence	Absence	P-value^a	Presence	Absence	P-value^a	Presence	Absence	P-value^a
	N (%)	N (%)	P-value^a	N (%)	N (%)	P-value^a	N (%)	N (%)	P-value^a	N (%)	N (%)	P-value^a
APP	18 (1.8)	205 (20.5)	0.005	130 (13)	93 (9.3)	0.01	46 (4.6)	177 (17.7)	0.074	1 (0.1)	222	0.74
PPP	6 (0.6)	31 (3.1)	0.001	18 (1.8)	19 (1.9)	0.799	12 (1.2)	25 (2.5)	0.009	2 (0.2)	35	0.000
APP and PPP	4 (0.4)	19 (1.9)	0.003	11 (1.1)	12 (1.2)	0.78	7 (0.7)	16 (1.6)	0.074	0	23	0.706

^aStatistically significant at level P < 0.05 (Pearson Chi-square test).
APP = alveolar process pneumatisation; PPP = palatal process pneumatisation; N = number.