Table 3.

Tinnitus severity scores of patient's pre- and post-therapy with Vitamin B₁₂ injections

Group	Mean tinnitus severity index score		Significance t, P and df
	Pretherapy	Posttherapy
Group A (injection B12)
With B12 deficiency	36.50±7.6	28.30±6.2	t=2.64, P=0.016*, df=18
Without B12 deficiency	38.16±12.0	37.23±11.2	t=0.17, P=0.85, df=18
Group B (injection NS)
With B12 deficiency	32.80±8.7	32.30±8.2	t=0.11, P=0.91, df=12
Without B12 deficiency	33.01±7.2	34.10±7.4	t=0.38, P=0.70, df=24

*Significant as P < 0.05 associated with paired t-test, df = Degree of freedom, NS = Normal saline