Table 1.

Mean (SD, n=4) sound pressure threshold (dB RMS re: 1 μPa) for each dosage before and after injection

	0 μg/g		100 μg/g		500 μg/g
Frequency	before	after	before	after	before	after
200	90.3 (1.0)	86.9 (2.8)	94.5 (6.1)	95.8 (6.8)	92.2 (6.1)	92.2 (6.1)
400	82.6 (3.9)	86.3 (4.3)	79.0 (2.6)	81.1 (5.6)	77.7 (3.0)	79.7 (3.4)
600	80.9 (2.6)	79.6 (4.3)	76.8 (4.8)	80.5 (5.0)	74.3 (2.5)	79.3 (2.5)
800	81.3 (4.1)	73.9 (2.4)	83.1 (4.2)	81.8 (6.4)	79.3 (2.5)	78.0 (0)
1000	76.5 (2.6)	78.4 (3.8)	84.1 (1.8)	87.4 (3.9)	82.8 (3.6)	86.0 (6.0)
1500	90.1 (4.9)	94.0 (6.6)	88.8 (6.4)	88.8 (6.4)	86.0 (2.5)	85.0 (4.1)
3000	100.7 (0)	99.0 (3.4)	106.4 (2.8)	106.4 (2.8)	105.2 (2.5)	102.6 (2.6)
	2500 μg/g		All Groups
Frequency	before	after	before	after	Difference
200	92.1 (6.1)	89.6 (8.3)	92.3 (5.0)	91.1 (6.6)	-1.2
400	80.0 (3.5)	78.3 (3.8)	79.8 (3.5)	81.3 (5.0)	1.5
600	80.7 (6.4)	78.0 (4.1)	78.2 (4.9)	79.3 (3.8)	1.1
800	83.2 (0.4)	81.7 (2.6)	81.7 (3.3)	78.8 (4.7)	-2.9
1000	88.4 (4.2)	86.7 (0.2)	83.0 (5.2)	84.6 (5.2)	1.6
1500	88.0 (5.4)	86.8 (5.4)	88.2 (4.7)	88.7 (6.2)	0.5
3000	103.1 (1.6)	103.1 (1.6)	103.8 (2.9)	102.8 (3.6)	-1.0