Ambient Sulphur Dioxide and Female ED Visits for Migraine

<table>Ottawa. ORs with their 95% CIs. (a) Controls ± 3 days. (b) Controls [<svg height="13.0125" id="M20" style="vertical-align:-1.76814pt" version="1.1" viewbox="0 0 38.174999 13.0125" width="38.174999" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,13.0125)">
<g transform="translate(72,-61.59)">
<text transform="matrix(1,0,0,-1,-71.95,63.4)">
<tspan style="font-size: 12.50px; " x="0" y="0">−</tspan>
<tspan style="font-size: 12.50px; " x="8.5645552" y="0">6</tspan>
<tspan style="font-size: 12.50px; " x="14.816055" y="0">,</tspan>
<tspan style="font-size: 12.50px; " x="24.180801" y="0">6</tspan>
</text>
</g>
</g>
</svg>].</table>

International Scholarly Research Notices

Ambient Sulphur Dioxide and Female ED Visits for Migraine

Figure 3