Table 2.

Median change in lesion depth over 6 months by caries initiation site

Site of lesion Initiation (surface)	n	Uninterrupted			Interrupted or lost			Datta and Satten two-sided p-value
		Black surface			Black surface
		Median (mm)	n	IQR	Median (mm)	n	IQR
Occlusal	22	−0.05	13	−0.22, 0.0	0.41	9	0.24, 0.59	0.0131
Approximal	66	−0.03	34	−0.09, 0.0	0.24	32	0.09, 0.41	0.0003
Total	88	−0.03	47	−0.12,0.00	0.24	41	0.12,0.47	<0.0001