Possible causal relationships between competitive swimming in growing age and three-dimensional dentoalveolar development

Progress in Orthodontics

Table 1 Angle’s Class bilateral molar relationships, symmetry of the molar relationship and crossbite

Variable	Swimmers	Non-swimmers	P(chi squared)
Bilateral molar relationship ^a
Angle's Class I	52	37	NS
Angle's Class II	14	12	NS
Angle's Class III	4	6	NS
Right/left molar relationship
Same	69	55	0.04
Different	31	45
Crossbite
Present	8	12	NS
Absent	92	88

^aConsidering only those subjects with the same molar relationships (swimmers, n = 70; non-swimmers, n = 55). NS, not significantly different.