Table 2.
Characteristics of the study population by nighttime road traffic noise (L night) exposure
| Nighttime road traffic noise (L night) n (%) | |||||
|---|---|---|---|---|---|
| Characteristic (no. missing) | < 45 dB 4285 (35.5) |
45- < 55 dB 5882 (48.7) |
≥ 55 dB 1899 (15.7) |
Total 12,066 (100) |
|
| Age (0) | 39 years | 793 (18.5) | 1196 (20.3) | 457 (24.1) | 2446 (20.3) |
| 49 years | 1035 (24.2) | 1257 (21.4) | 393 (20.7) | 2685 (22.3) | |
| 54 years | 942 (22.0) | 1215 (20.7) | 354 (18.6) | 2511 (20.8) | |
| 68–69 years | 1123 (26.2) | 1562 (26.6) | 504 (26.5) | 3189 (26.4) | |
| 84–85 years | 392 (9.1) | 652 (11.1) | 191 (10.1) | 1235 (10.2) | |
| Sex (0) | Women | 2320 (54.1) | 3156 (53.7) | 1040 (54.8) | 6516 (54.0) |
| Men | 1965 (45.9) | 2726 (46.3) | 859 (45.2) | 5550 (46.0) | |
| Marital status (1) | Married/cohabiting | 3238 (75.6) | 3946 (67.1) | 1058 (55.7) | 8242 (68.3) |
| Unmarried | 352 (8.2) | 803 (13.7) | 410 (21.6) | 1565 (13.0) | |
| Divorced/separated | 437 (10.2) | 728 (12.4) | 281 (14.8) | 1446 (12.0) | |
| Widow(er) | 258 (6.0) | 404 (6.9) | 150 (7.9) | 812 (6.7) | |
| Educational level (86) | Low | 523 (12.3) | 927 (15.9) | 319 (16.9) | 1769 (14.8) |
| Medium | 1501 (35.3) | 2127 (36.4) | 671 (35.6) | 4299 (35.9) | |
| High | 2230 (52.4) | 2786 (47.7) | 896 (47.5) | 5912 (49.3) | |
| Household income (13) | NOK < 500 k | 961 (22.4) | 1794 (30.5) | 725 (38.3) | 3480 (28.9) |
| NOK 500 k- < 1000 k | 1613 (37.7) | 2359 (40.1) | 742 (39.2) | 4714 (39.1) | |
| NOK ≥ 1000 k | 1708 (39.9) | 1724 (29.3) | 427 (22.5) | 3859 (32.0) | |
| Population density (0) | < 1000 dwellings/km2 | 1107 (25.8) | 905 (15.4) | 147 (7.7) | 2159 (17.9) |
| 1000–1500 dwellings/km2 | 1053 (24.6) | 1234 (21.0) | 277 (14.6) | 2564 (21.2) | |
| 1500–2500 dwellings/km2 | 1584 (37.0) | 1600 (27.2) | 342 (18.0) | 3526 (29.2) | |
| ≥ 2500 dwellings/km2 | 541 (12.6) | 2143 (36.4) | 1133 (59.7) | 3817 (31.6) | |
| Alcohol use (77) | Never / not last year | 316 (7.4) | 452 (7.7) | 178 (9.5) | 946 (7.9) |
| ≤ 3 times / month | 1264 (29.7) | 1793 (30.6) | 613 (32.6) | 3670 (30.6) | |
| 1–3 times / week | 2130 (50.1) | 2791 (47.7) | 802 (42.6) | 5723 (47.7) | |
| 4–7 times / week | 545 (12.8) | 815 (13.9) | 290 (15.4) | 1650 (13.8) | |
| Smoking status (112) | Current | 582 (13.7) | 945 (16.2) | 354 (18.8) | 1881 (15.7) |
| Former | 1565 (36.8) | 2225 (38.2) | 705 (37.4) | 4495 (37.6) | |
| Never | 2103 (49.5) | 2651 (45.5) | 824 (43.8) | 5578 (46.7) | |
| Physical activity (267) | Sedentary | 366 (8.7) | 638 (11.1) | 234 (12.6) | 1238 (10.5) |
| Moderately active | 2761 (65.7) | 3779 (65.7) | 1246 (67.3) | 7786 (66.0) | |
| Highly active | 1073 (25.5) | 1331 (23.2) | 371 (20.0) | 2775 (23.5) | |
| Night shift work (194) | 0 years | 3532 (83.7) | 4787 (82.8) | 1515 (80.9) | 9834 (82.8) |
| 1- < 5 years | 385 (9.1) | 493 (8.5) | 179 (9.6) | 1057 (8.9) | |
| ≥ 5 years | 304 (7.2) | 499 (8.6) | 178 (9.5) | 981 (8.3) | |
| Rail traffic noise (0) | < 35 dB | 3602 (84.1) | 4492 (76.4) | 1175 (61.9) | 9269 (76.8) |
| 35 dB- < 45 dB | 447 (10.4) | 903 (15.4) | 290 (15.3) | 1640 (13.6) | |
| ≥ 45 dB | 236 (5.5) | 487 (8.3) | 434 (22.9) | 1157 (9.6) | |
| Sleep medication total year (0) | Yes | 578 (13.5) | 827 (14.1) | 293 (15.4) | 1698 (14.1) |
| No | 3707 (86.5) | 5055 (85.9) | 1606 (84.6) | 10,368 (85.9) | |
| Sleep medication summer (0) | Yes | 259 (6.0) | 382 (6.5) | 167 (8.8) | 808 (6.7) |
| No | 4026 (94.0) | 5500 (93.5) | 1732 (91.2) | 11,258 (93.3) | |
Abbreviations: dB decibel, NOK Norwegian kroner