Table 3. The Prevalence of Accessory Bones, Tarsal Coalitions, and Symphalangisms in Normal Population According to Age.

Variable	Child (n = 112, 224 feet*; n = 18, 364 feet†)	Adult (n = 266, 532 feet)	p-value
Accessory navicular	49 (21.88)*	18 (34.0)	<0.01
Os subfibulare	1 (0.47)*	9 (1.7)	0.30
Os peroneum	0*	21 (3.9)	<0.01
Os trigonum	9 (4.02)*	31 (5.8)	0.15
Tarsal coalition	0*	2 (0.38)	1.00
4th symphalangism	13 (3.57)†	82 (15.98)	<0.01
5th symphalangism	113 (31.04)†	429 (80.6)	<0.01

Values are presented as number (%).

^*Prevalence of accessory bones observed since the first occurrence (male: 10 yr, female: 8 yr). ^†Prevalence of symphalangism observed since the first occurrence (male: 7 yr, female: 7 yr).