Table 1. Demographic and clinical characteristics of patients.

	n	%	Mean±SD	Range	95% CI
Age (year)			54.5±19.7	10-98	53.4-55.7
Sex
Female	359	29.4		N/A	N/A
Male	861	70.6		N/A	N/A
Presence of the fabella in those who have bilateral knee CT
Bilateral	170	23.2		N/A	N/A
Right	198	27.0		N/A	N/A
Left	210	28.7		N/A	N/A
Presence of the fabella in those who have unilateral knee CT
Right	62	24.5		N/A	N/A
Left	53	22.6		N/A	N/A
Presence of the fabella in all patients	353	28.9		N/A	N/A
SD: Standard deviation; CI: Confidence interval; CT: Computed tomography.