A cross-sectional study on the association between vitamin D levels and caries in the permanent dentition of Korean children

Table 2 Caries experience according to 25(OH)D levels

Variables	Classification	Caries experience in the permanent dentition			Permanent first molar caries experience
Variables	Classification	No	Yes	P ^*	No	Yes	P ^*
Vitamin D (two classification)	< 50 nmol	476 (45.3)	562 (54.7)	0.012	501 (47.6)	537 (52.4)	0.006
Vitamin D (two classification)	≥ 50 nmol	351 (53.0)	299 (47.0)		366 (55.8)	284 (44.2)
	OR^a	0.735			0.721
Vitamin D (four classification)	< 25 nmol	27 (40.3)	39 (59.7)	0.048	29 (44.6)	37 (55.4)	0.018
	≤ 25 to < 50 nmol	449 (45.7)	523 (54.3)		472 (47.9)	500 (52.1)
	≤ 50 to < 75 nmol	318 (52.4)	270 (47.6)		330 (55.0)	258 (45.0)
	≥ 75 nmol	33 (59.6)	29 (40.4)		36 (64.4)	26 (35.6)