Table 3

Significance for sleep bruxism in heavily, moderately, lightly and occasionally exposed children of group 2 (group where children's exposure was not reduced) at time 0 and time 1 after 6 months

	T0, n=52 (%)	T1, n=52 (%)
	Children with bruxism	Children with bruxism, n=46	Children without bruxism, n=6
Heavily exposed children	31 (60)	27 (52)	4 (8)	p0.15, RR^† 1.11, 95% CI 0.96 to 1.29 RD^** 8, 95% CI 7.16 to 9.05
Moderately exposed	8 (15)	8 (15)	0	p0.99, RR^† 1.01, 95% CI 0.72 to 1.39 RD^** 0.64, 95% CI 0.13 to 1.85
Lightly exposed children	8 (15)	7 (13)	1 (2)	p0.92, RR^† 1.02, 95% CI 0.72 to 1.44 RD^** 2, 95% CI 0.97 to 2.91
Occasionally exposed children	5 (10)	4 (8)	1 (2)	p 0.88, RR^† 0.59, 95% CI 0.12 to 1.83 RD^** 2, 95% CI 1.39 to 3.04

↵† 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 2.
↵** 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 2.