Table 1.

Description of treatment groups.

Group	N
Total	150
Control (no Pb, no Cd, sham noise)	16
Pb (no Cd, sham noise)
3 mM	16
lmM	8
0.03 mM	8
Cd (no Pb, sham noise)
300 μM	16
100 μM	7
30 μM	6
Noise (no Pb, no Cd)
108 dB	7
105 dB	15
102 dB	7
300 μM Cd + 3 mMPb (sham noise)	9
3 mM Pb + 105 dB Noise (no Cd)	14
300 μM Cd + 105 dB Noise (no Pb)	14
300 μM Cd + 3 mM Pb + 105 dB Noise	7