Table 4.
Crude prevalence odd ratios (PORs) and their 95% confidence intervals for traffic noise-annoyance and insomnia per 5 dB(A) increase in traffic noise exposure
| Traffic noise indicator | N | Reference dB(A) | POR | 95% confidence interval | |
|---|---|---|---|---|---|
| Lower limit | Upper limit | ||||
| Annoyance daye | |||||
| Lden a | 2715 | <55 | 1.76 | 1.64 | 1.88 |
| Lden indoor c | 2537 | <35 | 1.32 | 1.26 | 1.38 |
| Annoyance nighte | |||||
| Lden a | 2716 | <55 | 1.58 | 1.48 | 1.68 |
| Lnight b | 2716 | <45 | 1.55 | 1.46 | 1.65 |
| Lnight indoor d | 2565 | <25 | 1.22 | 1.17 | 1.27 |
| Insomniaf | |||||
| Lden a | 3011 | <55 | 1.05 | 0.97 | 1.15 |
| Lnight b | 3011 | <45 | 1.06 | 0.98 | 1.16 |
| Lnight indoor d | 2667 | <25 | 1.06 | 1.00 | 1.12 |
a24-hour mean road traffic noise at the most exposed façade.bNight-time mean traffic road noise at the most exposed façade.c24-hour mean road traffic noise in living room.dNight mean road traffic noise in bedroom.eAnswered with any of the following: somewhat, moderately, strongly, or extremely annoyed.fDifficulty falling asleep or maintaining sleep, or early arousal on at least two nights a week during the past four weeks.