Table 5.
Crude prevalence odds ratios (PORs) and their 95% confidence intervals for having eight or more headache days a month in the past three months per 5 dB(A) increase in traffic noise exposure above the reference stratified by traffic noise-annoyance and insomnia
| Traffic noise indicator | Reference dB(A) | POR | Lower limit | Upper limit | POR | Lower limit | Upper limit |
|---|---|---|---|---|---|---|---|
| Day time traffic noise-annoyance e | |||||||
| Yes (n = 1,078) | No (n = 1,350) | ||||||
| Lden a | <55 | 1.03 | 0.72 | 1.46 | 0.97 | 0.65 | 1.46 |
| Lden,indoor c | <35 | 0.97 | 0.76 | 1.24 | 0.93 | 0.70 | 1.23 |
| Night time traffic noise-annoyancee | |||||||
| Yes (n = 610) | No (n = 1,818) | ||||||
| Lden a | <55 | 1.11 | 0.73 | 1.66 | 0.88 | 0.61 | 1.25 |
| Lnight b | <45 | 1.09 | 0.72 | 1.63 | 0.86 | 0.61 | 1.21 |
| Lnight,indoor d | <25 | 1.06 | 0.82 | 1.36 | 1.02 | 0.85 | 1.22 |
| Insomniaf | |||||||
| Yes (n = 257) | No (n = 2,171) | ||||||
| Lden a | <55 | 1.36 | 0.79 | 2.36 | 0.89 | 0.66 | 1.19 |
| Lnight d | <45 | 1.35 | 0.80 | 2.29 | 0.86 | 0.65 | 1.15 |
| Lnight,indoor e | <25 | 0.97 | 0.67 | 1.40 | 1.04 | 0.89 | 1.21 |
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.f Difficulty falling asleep or maintaining sleep, or early arousal on at least two nights a week during the past four weeks.