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Table 1 Mean Opinion Score (MOS) evaluation scale

From: Data analysis on video streaming QoE over mobile networks

Score Quality Distortion Class
1 Bad Very annoying but objectionable 0
2 Poor Annoying, but not objectionable  
3 Fair Perceptible and slightly annoying 1
4 Good Just perceptible, but not annoying  
5 Excellent Imperceptible  
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