Table 3. The WOMAC Score Changes in the Ozone Group Versus the LLLT Group.

	Time Point	Ozone Group (n = 30)	LLLT Group (n = 30)	Total (n = 60)	P Value**
WOMAC score	basic	50.03 ± 2.87	49.5 ± 2.02	49.91 ± 2.32	0.088
	Mid of treatment	37.01 ± 2.22	42.31 ± 1.32	39.66 ± 1.75	0.045
	End of study	27.61 ± 2.01	35.24 ± 1.53	31.45 ± 1.74	0.004
P value *	0.001	0.001	0.001

* Within group P values.

** Between group P values.