Table 2.

Person-level net caries incidence by study time period

Incidence period*	Unerupted surfaces included**				Only erupted surfaces included
	Number of children***	Incidence (% with Δ dmfs>0) (range)			Number of children	Incidence (% with Δ dmfs>0) (range)
		Occlusal	Non-occlusal	Total****		Occlusal	Non-occlusal	Total*****
Age 1 to age 2	86	4.7 (0–6)	11.6 (0–24)	12.8 (0–30)	80	10.0 (0–4)	11.3 (0–20)	12.5 (0–20)
Age 1 to age 3	84	22.6 (0–10)	38.1 (0–54)	39.3 (0–64)	78	20.0 (0–4)	23.1 (0–34)	23.1 (0–38)
Age 1 to age 4	73	50.7 (0–10)	57.5 (0–62)	65.8 (0–72)	67	21.1 (0–4)	32.9 (0–34)	33.1 (0–38)
Age 2 to age 3	83	22.9 (0–10)	37.4 (0–43)	38.6 (0–53)	83	21.7 (0–10)	34.9 (0–43)	38.6 (0–53)
Age 2 to age 4	72	51.4 (0–10)	58.33 (0–48)	66.7 (0–57)	72	38.9 (0–6)	51.4 (0–34)	59.7 (0–52)
Age 3 to age 4	73	40.1 (0–9)	46.6 (0–39)	56.2 (0–47)	73	41.1 (0–8)	45.2 (0–36)	54.8 (0–47)

^*Approximated ages.

^**Unerupted surfaces at the beginning of the incidence period were assumed to be sound.

^***Seventy-two children had all four dental examinations.

^****When surfaces unerupted at baseline were included, about 66% of the children had caries incidence (maximum 72 surfaces) during the three-year follow-up.

^*****When only surfaces erupted at baseline were included, about 33% of the children had caries incidence (maximum 38 surfaces) during the three-year follow-up.