# Plus or minus in footnote that doesn't add extra line

I'm attempting to use the +/- sign within a footnote, however when I use the following command it creates a line break and takes up a lot of extra space.

I believe its because I'm putting it in as an equation within a footnote, however I'm not sure how to go about getting the symbol any other way...

~\footnote[1]{The threshold was set at $\pm$20\%}.
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Why not simply use $\pm$ or $$\pm$$? –  kan Sep 9 '12 at 11:18
Inexperience with LaTeX mostly... –  espais Sep 9 '12 at 12:58
Why do you use the ~ in front of \footnote? Footnote numbers should follow the text without a printed space. –  Kurt Sep 9 '12 at 14:26
@Kurt: thanks for the point. –  espais Sep 10 '12 at 19:42
Simply replace the displayed math-mode  by an inline math-mode (between $symbols): ~\footnote[1]{The threshold was set at$\pm20\%\$}.