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Table 1 Demographic and socioeconomic variables of subjects according to NS
| Total (n = 1836) | Low NS (n = 1028) | High NS (n = 808) | t-test or χ2 test | |
|---|---|---|---|---|
| Age (years) | 47.04 ± 16.09 | 45.99 ± 16.31 | 48.37 ± 15.72 | 0.002 |
| Sex, male | 696 (37.9) | 433 (42.1) | 263 (32.5) | <0.001 |
| Duration of residence (years) | 9.11 ± 8.47 | 8.61 ± 8.05 | 9.75 ± 8.94 | 0.005 |
| Education level | ||||
| High school or below | 858 (46.7) | 446 (43.4) | 412 (51.0) | 0.001 |
| College or above | 978 (53.3) | 582 (56.6) | 396 (49.0) | |
| Marital status | ||||
| Single | 495 (27.0) | 321 (31.2) | 174 (21.5) | 0.001 |
| Married | 1103 (60.1) | 574 (55.8) | 529 (65.5) | |
| Other a | 239 (13.0) | 133 (12.9) | 105 (13.0) | |
| Monthly income (USD) | ||||
| <3000 | 729 (39.7) | 427 (41.5) | 302 (37.4) | 0.07 |
| ≥3000 | 1107 (60.3) | 601 (58.5) | 506 (62.6) | |
| Ldn(dBA) | 55.24 ± 10.33 | 54.93 ± 10.25 | 55.63 ± 10.43 | 0.149 |
| NS | 5.25 ± 2.23 | 3.64 ± 1.36 | 7.29 ± 1.20 | 0.002 |
