Table 1 Predicted sound type prevalence (average % of time present), predicted Lday and Lnight sound levels (dBA)54and combined soundtype index values for locations in the greater Accra metropolitan area (GAMA) and the Accra metropolis (urban core). Data are summarized as median and interquartile ranges (IQR).
GAMA | Accra Metropolis | |||
|---|---|---|---|---|
Sound level (dBA) | Day-time | Night-time | Day-time | Night-time |
58.4 (56.1, 60.7) | 51.2 (49.6, 53.3) | 62.3 (59.4, 64.9) | 54.6 (52.0, 57.5) | |
Percentage of time sound types are present (%) | Day-time | Night-time | Day-time | Night-time |
Road-transport sound prevalence | 55.8 (46.1, 69.4) | 34.7 (27.9, 46.3) | 75.7 (67.8, 80.3) | 55.1 (46.7, 63.8) |
Animal and insect sound prevalence | 55.2 (43.4, 62.2) | 65.6 (55.4, 73.5) | 31.3 (20.8, 44.8) | 47.3 (38.1, 56.5) |
Music sound prevalence | 6.5 (4.7, 10.2) | 5.1 (3.7, 6.9) | 13.8 (8.7, 19.2) | 9.5 (6.2, 12.3) |
Speech sound prevalence | 17.0 (12.8, 26.1) | 4.2 (3.3, 6.7) | 31.3 (23.3, 42.8) | 9.6 (5.5, 14.3) |
SoundType index (range: 0–1) | Day-time | Night-time | Day-time | Night-time |
Road-transport sound index | 0.27 (0.20, 0.35) | 0.12 (0.09, 0.18) | 0.41 (0.33, 0.47) | 0.23 (0.18, 0.29) |
Animal and insect sound index | 0.25 (0.21, 0.27) | 0.23 (0.20, 0.26) | 0.17 (0.12, 0.22) | 0.19 (0.16, 0.22) |
Music sound index | 0.03 (0.02, 0.05) | 0.02 (0.01, 0.03) | 0.08 (0.04, 0.11) | 0.04 (0.02, 0.05) |
Speech sound index | 0.08 (0.05, 0.13) | 0.02 (0.01, 0.02) | 0.17 (0.11, 0.25) | 0.04 (0.02, 0.06) |
