Table 2

Significance for sleep bruxism in heavily, moderately, lightly and occasionally exposed children of group 1 (group where children's exposure was reduced) at time 0 and time 1 after 6 months

	T0, n=55 (%)	T1, n=55 (%)
	Children with bruxism	Children with bruxism, n=21	Children without bruxism, n=34
Heavily exposed children	31 (56)	6 (11)	25 (45)	p<0.0001^, RR^† 4.50, 95% CI 2.17 to 9.35 RD^* 45, 95% CI 41.63 to 47.87
Moderately exposed	10 (18)	4 (7)	6 (11)	p0.027^, RR^† 2.22, 95% CI 1.01 to 4.91 RD^* 11, 95% CI 8.73 to 13.06
Lightly exposed children	7 (13)	5 (9)	2 (4)	p0.43, RR^† 1.23, 95% CI 0.72 to 2.10 RD^** 4, 95% CI 3.16 to 5.57
Occasionally exposed children	7 (13)	6 (11)	1 (2)	p0.90, RR^† 0.97, 95% CI 0.61 to 1.55 RD^** 2, 95% CI 1.18 to 2.86

↵* Significant at p<0.05. p Values are from Pearson χ² test.
↵† RR, relative risk of sleep bruxism in heavily, moderately, lightly and occasionally exposed children at T0 compared with heavily, moderately, lightly and occasionally exposed children at T1, in group 1.
↵** RD, risk difference of sleep bruxism in heavily, moderately, lightly and occasionally exposed children at T0 compared with heavily, moderately, lightly and occasionally exposed children at T1, in group 1.