Table7. Measures of central dispersion for calcification in the groups .

Group	Intervention	Sample size*	Mean	Std. deviation	Maximum	Minimum
0	Negative(No cell)-control	10	0.51	0.08	0.71	0.43
1	OM	9	0.59	0.02	0.63	0.55
2	VD	9	0.70	0.05	0.75	0.64
3	660nm, 10s	10	0.68	0.04	0.74	0.61
4	VD+ 660 nm, 10s	8	0.84	0.06	0.92	0.75
5	660nm, 17s	10	0.69	0.09	0.84	0.58
6	VD+ 660nm, 17s	9	0.98	0.09	1.01	0.83

^* One unit of cells in each of the groups 1, 2, and 6, and two units of cells in group 4 were lost during the experiment, and their data could not be used in statistical analysis. OM: Osteogenic medium; VD: Vitamin D