Chronic otitis media and middle ear variants: Is there relation?

Table 1 Comparison of the frequency of variants between case and control groups, n (%)

Variantsa	Case (n = 500)	Control (n = 500)	P value
Koerner’s septum +	77 (15.4)	93 (18.6)	0.178
Koerner’s septum -	423 (84.6)	407 (81.4)
Facial canal dehiscence +	193 (38.6)	206 (41.2)	0.401
Facial canal dehiscence -	307 (61.4)	294 (58.8)
High jugular bulb +	91 (18.2)	23 (4.6)	< 0.001
High jugular bulb -	409 (81.8)	477 (95.4)
Jugular dehiscence +	13 (2.6)	6 (1.2)	0.105
Jugular dehiscence -	487 (97.4)	494 (98.8)
Jugular diverticulum +	4 (0.8)	0 (0)	-
Jugular diverticulum -	496 (99.2)	0 (0)
Anterior located sigmoid sinus +	43 (8.6)	19 (3.8)	0.002
Anterior located sigmoid sinus -	457 (91.4)	481 (96.2)
Deep tympanic recess +	0 (0)	0 (0)	-
Deep tympanic recess -	500 (100)	500 (100)

^aP value was obtained from Pearson Chi Square test.

+: Indicates the presence of the variant; -: Indicates the absence of the variant.

Table 2 Comparison the frequency of the variants’s side between case and control groups, n (%)

	Case (n = 500)	Control (n = 500)	P value
Koerner’s septum
Right	36 (46.8)	31 (33.3)	0.057
Left	29 (37.7)	34 (36.6)
Bilateral	12 (15.6)	28 (30.1)
Facial canal dehiscence
Right	68 (35.4)	49 (23.8)	0.003
Left	84 (43.8)	85 (41.3)
Bilateral	40 (20.8)	72 (35)
High jugular bulb
Right	39 (42.9)	10 (50)	0.763
Left	40 (44)	7 (35)
Bilateral	12 (13.2)	3 (15)
Jugular dehiscence
Right	8 (61.5)	3 (50)	0.812
Left	4 (30.8)	2 (33.3)
Bilateral	1 (7.7)	1 (16.7)
Jugular diverticulum
Right	3 (75)	0 (0)	---
Left	1 (25)	0 (0)
Bilateral	0 (0)	0 (0)
Anterior located sigmoid sinus
Right	26 (60.5)	10 (62.5)	0.547
Left	14 (32.6)	6 (37.5)
Bilateral	3 (7)	0 (0)
Deep tympanic recess
Right	0 (0)	0 (0)	---
Left	0 (0)	0 (0)
Bilateral	0 (0)	0 (0)

P value was obtained from Pearson Chi Square test.