Table 4.

Tooth fracture experience related to physical exercises.

Physical Activities *	Tooth Fracture Experience (%)	p Value
Days of ≥60-min physical exercise		<0.001
None	10.8
1 day	12.1
2 days	10.7
3 days	11.6
4 days	10.7
5 days	12.7
6 days	11.4
7 days	15.1
Days of intensive physical exercise		<0.001
None	10.6
1 day	11.3
2 days	11.0
3 days	11.2
4 days	11.7
≥5 days	13.6
Days of muscle strength exercise		<0.001
None	10.5
1 day	11.8
2 days	12.3
3 days	11.8
4 days	12.2
≥5 days	13.6
Number of school gym classes		<0.001
None	11.6
1	11.4
2	10.7
≥3	12.1

* frequency in the past 7 days. p value was determined by complex-sample chi-square test.