From the BBC:

Scientists found a woman's level of fear and anxiety about surgery was likely to be raised if their birth partner was anxious too.
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The researchers say birth partners should be prepared for the possibility of a caesarean at antenatal classes, and briefed about the procedure in advance if it is decided to go ahead.
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Women who had the most negative expectations before the operation experienced the highest levels of post-operative pain.
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"It is not unreasonable for the birth partner to have some feelings of anxiety and fear about the operation they are about to witness."

No, really? I never would've guessed that mothers react to pain, surgery, and nebulous and mysterious medical treatment in exactly the same way as everyone else has been known to for years. I never would've guessed that anxiety plays a role in fear - I thought pain management experts just emphasized comforting the patient for fun! Nor would I ever have guessed that anxiety in one person could inspire anxiety in another. Bah. Whose money was wasted on this study?