Have you seen the commercial for Clear Blue Easy Pregnancy Test? The one that says, "Did you know that 1 in 4 women can misread a traditional pregnancy test result?"
I searched for a video clip of the commercial, but couldn't find anything. But I did find it written their website here. In case you haven't seen the commercial and think I'm making this up.
That statistic surprised me. I think, "1 in 4 women can deny a pregnancy test" is more accurate.