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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

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