Slight: Only heard in quiet environment, very easily masked. No interference with sleep or daily
activities.
2
18-36
Mild: Easily masked by environmental sounds and easily forgotten with activities. May
occasionally interfere with sleep but not daily activities.
3
38-56
Moderate: May be noticed, even in the presence of background or environmental noise,
although daily activities may still be performed.
4
58-76
Severe: Almost always heard, rarely, if ever, masked. Leads to disturbed sleep pattern and can
interfere with ability to carry out normal daily activities. Quiet activities affected adversely.
5
78-100
Catastrophic: Always heard, disturbed sleep patterns, difficulty with any activity.