Table 1.

Net Increment of Dental Caries Traits over a 12-month Period by Age Group in Twins

Dental Caries Phenotypes	Visit/Δ Change	1.5 < 4 yrs old# (n = 133)	Age Groups 4–6 yrs old# (n = 291)	> 6 yrs old# (n = 204)
Overall Caries Rates
SBCPR	Baseline	2.4 ± 5.5a	9.1 ± 9.0	14.4 ±10.0
	12-month	6.1 ± 8.4	10.8 ± 9.7	14.6 ± 9.6
	Δ Change	3.8 ± 7.2	1.6 ± 5.7	0.3 ± 6.8
LSI	Baseline	0.05 ± 0.1	0.2 ± 0.2	0.3 ± 0.3
	12-month	0.1 ± 0.2	0.3 ± 0.1	0.3 ± 0.3
	Δ Change	0.08 ± 0.2	0.04 ± 0.3	− 0.01 ± 0.2
Caries Rates by Surface
SBCPR	Baseline	1.2 ± 2.2	4.3 ± 3.0	6.2 ± 3.0
Occlusal	12-month	2.7 ± 3.0	4.5 ± 3.2	6.1 ± 3.2
	Δ Change	1.6 ± 2.5	0.3 ± 2.2	− 0.02 ± 2.6
SBCPR	Baseline	0.2 ± 0.8	1.2 ± 2.1	2.0 ± 2.4
Mesial	12-month	0.7 ± 1.5	1.4 ± 2.2	1.5 ± 1.9
	Δ Change	0.5 ± 1.4	0.2 ± 1.4	− 0.5 ± 1.9
SBCPR	Baseline	0.1 ± 0.4	1.0 ± 1.8	1.8 ± 2.2
Distal	12-month	0.4 ± 1.2	1.3 ± 2.0	1.6 ± 1.9
	Δ Change	0.4 ± 1.1	0.2 ± 1.5	− 0.2 ± 1.5
SBCPR	Baseline	0.7 ± 2.0	1.7 ± 2.7	2.5 ± 3.0
Buccal	12-month	1.4 ± 3.0	2.0 ± 2.8	2.7 ± 2.8
	Δ Change	0.8 ± 2.9	0.4 ± 2.5	0.2 ± 2.6
SBCPR	Baseline	0.3 ± 1.8	1.0 ± 1.6	1.9 ± 2.2
Lingual	12-month	0.9 ± 1.8	1.6 ± 1.9	2.6 ± 2.3
	Δ Change	0.6 ± 2.0	0.6 ± 1.6	0.7 ± 2.2
Caries Rates by Severity
SBCPR	Baseline	0.8 ± 1.9	2.3 ± 2.6	3.2 ± 3.3
White-spot	12-month	2.0 ± 3.6	2.4 ± 3.3	3.3 ± 3.8
	Δ Change	1.2 ± 3.8	0.1 ± 3.5	0.04 ± 3.8
SBCPR	Baseline	0.8 ± 2.2	2.8 ± 2.9	4.4 ± 3.1
Initial Enamel	12-month	2.5 ± 3.4	3.9 ± 3.7	6.1 ± 4.0
	Δ Change	1.7 ± 3.2	1.1 ± 3.1	1.7 ± 3.3
SBCPR	Baseline	0.6 ± 1.9	2.5 ± 3.4	3.7 ± 3.6
Initial Dentin	12-month	0.8 ± 1.9	2.0 ± 2.7	2.1 ± 2.5
	Δ Change	0.2 ± 2.2	−0.5 ± 2.5	− 1.6 ± 2.9
SBCPR	Baseline	0.2 ± 0.7	1.6 ± 3.5	3.1 ± 4.4
Deep Dentin	12-month	0.8 ± 3.6	2.4 ± 4.7	3.2 ± 4.3
	Δ Change	0.7 ± 3.1	0.8 ± 2.6	0.1 ± 3.5

^#Age at baseline;

^amean ± SD.

SBCPR, surface-based caries prevalence rates; LSI, lesion severity.