Table 4.

Correlation between severity of dental fluorosis (Dean’s fluorosis Index) and Raven’s SPM grades – Spearman’s correlation

Dean’s		Raven’s SPM Grade					Total
Fluorosis index		Grade I	Grade II	Grade III	Grade IV	Grade V
	1	0	0	0	0	0	0
	2	0	6	3	0	0	9
	3	0	3	21	3	0	27
	4	0	0	9	3	6	18
	5	0	0	0	0	6	6
Total		9	33	6	12	60
Spearman’s Correlation coefficient			0.452	Asymptotic Standard Error 0.080		P .000