Table 1.

Overall Descriptive Statistics for Sound Levels in Boston, Massachusetts (Mean (SD), Median (IQR), 10th and 90th values and Spearman Correlations for Low Frequency (25 – 125 Hz), Mid Frequency (250 – 1,000 Hz), High Frequency (2,000 – 16,000 Hz), and A-weighted Sound (n = 400 monitoring sites)

Sound Level	Mean (SD)	P50 (IQR)	P10	P90
Low Frequency (dB)	70.7 (6.8)	70.5 (10.1)	61.6	79.3
Mid Frequency (dB)	62.4 (7.6)	62.5 (11.7)	53.1	71.6
High Frequency (dB)	53.0 (8.6)	52.8 (13.7)	42.1	63.1
A-weighted (dB(A))	60.7 (7.9)	60.5 (12.6)	51.1	70.2