Table 2.

Spearman's correlation coefficients between different methods.

	Spearman's correlation coefficient (r s)
	LF	FC	BW	Gold standard
ICDAS-II	0.66**	0.84**	0.36**	0.82**
LF	—	0.72**	0.27*	0.69**
FC	—	—	0.26*	0.81**
BW	—	—	—	0.22*

*Correlation significant at the 0.05 level (two tailed).

**Correlation significant at the 0.01 level (two tailed).