Table 2.
Levels of SBP and DBP in the subjects of noise exposed and non-exposed groups
| Groups | n | SBP | DBP | ||
|---|---|---|---|---|---|
| Mean ± SD | P value* | Mean ± SD | P value* | ||
| Non-exposed group | 1399 | 117.2 ± 15.7 | 70.0 ± 10.5 | ||
| Exposed group | 1390 | 125.1 ± 13.9 | <0.001 | 77.6 ± 10.7 | <0.001 |
| Noise intensity (dB) | |||||
| 80- | 490 | 124.2 ± 14.7# | 75.8 ± 11.1# | ||
| 85- | 571 | 124.9 ± 12.8# | 78.1 ± 10.1#,$ | ||
| 90- | 237 | 126.2 ± 14.6# | <0.001 | 78.8 ± 11.1#,$ | <0.001 |
| ≥ 95 | 92 | 129.1 ± 13.8#,$,§ | 80.7 ± 9.5#,$ | ||
| Work-years of noise exposure | |||||
| 1- | 795 | 123.9 ± 13.4# | 76.0 ± 10.3# | ||
| 5- | 394 | 125.7 ± 13.8#,$ | 78.8 ± 10.3#,$ | ||
| 10- | 100 | 126.8 ± 13.8#,$ | <0.001 | 81.5 ± 11.5#,$,§ | <0.001 |
| ≥ 15 | 101 | 130.7 ± 16.5#,$,§ | 81.3 ± 11.1#,$,§,§ | ||
| cumulative noise exposure | |||||
| 80- | 479 | 123.3 ± 12.9# | 75.2 ± 10.1# | ||
| 90- | 434 | 124.8 ± 13.9# | 77.5 ± 10.5#,$ | ||
| 95- | 274 | 126.0 ± 15.1#,$ | <0.001 | 79.3 ± 11.5#,$,§ | <0.001 |
| ≥ 100 | 203 | 128.8 ± 13.9#,$,§,& | 81.0 ± 9.8#,$,§ | ||
| Noise category | |||||
| Stable | 451 | 124.7 ± 12.5 | 77.6 ± 9.2 | ||
| Unstable | 939 | 125.4 ± 14.5 | 0.369 | 77.6 ± 11.3 | 0.958 |
| Noise protection | |||||
| Yes | 956 | 124.4 ± 12.0 | 77.3 ± 9.3 | ||
| No | 185 | 124.6 ± 13.7 | 0.855 | 77.3 ± 10.8 | 0.983 |
*P values were calculated by one-way ANOVA, and then followed by SNK for multiple comparison. #significant difference with non-exposed group. $, significant difference with the group of 80- for Noise intensity, 1- for Work-years of noise exposure, and 80- for cumulative noise exposure. §, significant difference with the group of 85- for Noise intensity, 5- for Work-years of noise exposure, and 90- for cumulative noise exposure. &, significant difference with the group of 90- for Noise intensity, 10- for Work-years of noise exposure, and 95- for cumulative noise exposure