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Table 3 Prevalence odds ratios (PORs) and 95% confidence intervals of having eight or more headache days a month in the past three months for those expressing traffic noise-annoyance or insomnia

Table 3 Prevalence odds ratios (PORs) and 95% confidence intervals of having eight or more headache days a month in the past three months for those expressing traffic noise-annoyance or insomnia