The bad habit of nail-biting is much more common than you might think.
Some studies have found about one-quarter of children bite their nails habitually (Ghanizadeh & Shekoohi, 2011), others say it may peak at almost 45% in adolescence (Peterson et al., 1994).
More surprisingly, the prevalence amongst adults may be just as high, with some estimates at 50% (Hansen et al., 1990). I had no idea it was potentially that high—I guess it’s a habit that people hide well from others.
Quote: How to Stop Biting Your Nails — PsyBlog
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