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Table 2. variation of sleep quality variables as a function of the number of noise events per night at 50 and 60 dB(A). After (Öhrström and Rylander, 1990).

Table 2. variation of sleep quality variables as a function of the number of noise events per night at 50
and 60 dB(A). After (Öhrström and Rylander, 1990).