Table 1.

The association between the occurrence of tonsillar ectopia and different categorical variables.

Tonsillar ectopia
	Yes	No	P-value
IS	29 (37%)	50 (63%)
Control	10 (13%)	66 (87%)	< 0.001
Odds Ratio 3.8 (95% CI 1.7-8.5)
Gender
	Male	Female
Ectopia	16 (55%)	23 (45%)
No ectopia	20 (40%)	30 (60%)	0.54
Neurological deficit
	Yes	No
Ectopia	6 (21%)	23 (79%)
No ectopia	5 (10%)	45 (90%)	0.31
Pain
	Yes	No
Ectopia	10 (34%)	19 (66%)
No ectopia	16 (32%)	34 (68%)	0.82
Rapid progression of scoliosis
	Yes	No
Ectopia	4 (14%)	25 (86%)
No ectopia	9 (18%)	41 (82%)	0.76
Atypical scoliosis
	Yes	No
Ectopia	1 (3%)	28 (97%)
No ectopia	7 (14%)	43 (86%)	0.24
Occurrence of tonsillar ectopia among patients with IS only vs those with IS and other associated abnormalities
	Yes	No
Ectopia	19 (37%)	10 (36%)
No ectopia	32 (63%)	18 (64%)	1.0