Table4. Measures of central dispersion for cell viability 72 hours after the last beam exposure cycle for all six groups .

Group	Intervention	Sample size*	Mean	Std. deviation	Maximum	Minimum
1	OM(Control)	4	99.53	1.26	101.17	98.54
2	VD	4	102.54	1.11	104.18	101.74
3	660nm 10s	5	99.63	3.40	102.87	95.91
4	VD 660 nm 10s	5	104.07	1.89	105.88	102.11
5	660nm 17s	5	111.51	2.36	114.66	109.00
6	VD 660nm 17s	5	113.74	1.98	116.78	112.27

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