Table 1.

DMFS outcome data at baseline and change in DMFS during the follow-up period for each tobacco group and birth cohort, with p-values for the tobacco group comparisons of change in DMFS

Birth cohort	Tobacco group	DMFS baseline 16 years				Change in DMFS, 16–19 years
		N	Mean	SiC*	CF†	N	ΔMean	ΔSiC	ΔDMFS>0%‡	p-value§
1990	Ever users	390	3.7	7.7	27.7	390	1.8	4.2	57.2	< 0.001
	Never users	2233	2.9	7.6	35.9	2233	1.3	4.1	43.9
1991	Ever users	342	3.9	8.3	25.4	342	2.0	4.5	57.3	< 0.001
	Never users	2191	2.6	7.5	39.4	2191	1.3	4.5	40.9
1992	Ever users	357	3.5	8.0	31.1	357	1.8	4.6	56.0	< 0.001
	Never users	2070	2.7	7.6	38.4	2070	1.2	4.1	41.6
1993	Ever users	370	3.5	7.8	33.5	370	1.6	4.6	46.5	< 0.001
	Never users	2116	2.5	7.3	41.0	2116	0.9	3.9	35.3
Total	Ever users	1459	3.6	7.9	29.5	1459	1.8	4.5	54.2	< 0.001
	Never users	8609	2.7	7.5	38.7	8610	1.2	4.2	40.5

* Significant caries index based on DMFS.

† Proportion caries-free.

‡ Proportion with new caries during the observation period (16–19 years).

§ P-value from the Wilcoxon-Mann–Whitney test comparing the distributions of DMFS between ever vs. never users.

The overall p-value < 0.0001 (stratified Wilcoxon-Mann–Whitney test).