Some users may not be familiar with the term 'Preferred Output Format'. Might it be an idea to make the label dynamic and substitute the current value of calibre prefs[output_format] into the label?
So for me the label would read 'Use EPUB if available?' whereas for a Kindle user the label would read 'Use AZW3 if available?'
The tooltip could be more specific (and also dynamic) and start something like 'Your current calibre Preferred Output Format is set to xxx. Check this option if you want the statistics to be calculated using this format if available. If not checked or xxx is not available ... etc'
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