| | ⑴ ≤25dB HL | ⑵ 26 | 40dB HL | | | | | | | ⑶ | 41 60dB HL | 1 | | | | | | | ⑷ 61 | 80dB HL | | | ⑸ | >80dB HL | | | | | |