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0 to 6 wk
40 to 60 dB
6 wk to 4 mon
47 dB
4 to 7 mon
21 dB
7 to 9 mon
15 dB
9 to 13 mon
8 dB
13 to 16 mon
5 dB
16 to 21 mon
21 to 24 mon
3 dB