Table 1 Descriptive statistics for measured L EQ noise levels
From: Street-level noise in an urban setting: assessment and contribution to personal exposure
Variable | Category | N | Mean L EQ (dBA) | Std. Dev. | p-value* | N (%) of measurements ≥ 70 dBA | N (%) of measurements ≥ 80 dBA |
|---|---|---|---|---|---|---|---|
Total | Â | 329 | 73.4 | 6.1 | Â | 241 (73.3) | 46 (14.0) |
Borough | Manhattan | 259 | 74.6 | 5.4 | <0.0001 | 214 (82.6) | 41 (15.8) |
| Â | Outer boroughs | 70 | 69.1 | 6.6 | Â | 27 (38.6) | 5 (7.1) |
| Â | Bronx | 20 | 67.5 | 6.1 | Â | 6 (30.0) | 1 (5.0) |
| Â | Brooklyn | 20 | 68.8 | 6.0 | Â | 6 (30.0) | 1 (5.0) |
| Â | Queens | 20 | 70.5 | 7.3 | Â | 11 (55.0) | 2 (10.0) |
| Â | Staten island | 10 | 70.5 | 7.4 | Â | 4 (40.0) | 1 (10.0) |
Time of day | Early morning | 69 | 74.3 | 4.2 | 0.0007 | 59 (85.5) | 7 (10.1) |
| Â | Late morning | 100 | 72.4 | 6.4 | Â | 64 (64.0) | 13 (13.0) |
| Â | Afternoon | 99 | 72.4 | 6.5 | Â | 65 (65.7) | 9 (9.1) |
| Â | Evening | 61 | 76.0 | 6.0 | Â | 53 (86.9) | 17 (27.9) |
Traffic level | Low | 93 | 68.4 | 4.8 | <.0001 | 35 (37.6) | 1 (1.1) |
| Â | Medium | 120 | 73.8 | 4.3 | Â | 98 (81.7) | 12 (10.0) |
| Â | High | 116 | 77.2 | 5.9 | Â | 108 (93.1) | 33 (28.4) |
Nearby | Vehicle traffic | 188 | 74.6 | 5.4 | <.0001 | 153 (81.4) | 31 (16.5) |
conditions | Pedestrian traffic | 28 | 75.4 | 7.0 | Â | 23 (82.1) | 4 (14.3) |
| Â | Music | 6 | 72.8 | 3.2 | Â | 5 (83.3) | 0 (0.0) |
| Â | Construction | 21 | 73.0 | 7.0 | Â | 15 (71.4) | 4 (19.0) |
| Â | Sirens | 18 | 76.8 | 4.3 | Â | 17 (94.4) | 4 (22.2) |
| Â | Subway | 10 | 71.5 | 7.0 | Â | 5 (50.0) | 1 (10.0) |
| Â | Quiet | 51 | 67.6 | 5.3 | Â | 17 (33.3) | 2 (3.9) |
| Â | Water (fountain) | 7 | 74.2 | 4.1 | Â | 6 (85.7) | 0 (0.0) |