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The results also showed that fingernails now grow by 3.47mm every month â almost twice as fast as toenails. The nails of younger people and men grow faster. The little finger nail grows much more slowly than other fingernails, at a rate of 3.08mm each month. The middle finger has the fastest-growing nail.
They agree with the basic hypothesis, which is that fingernails grow faster than toenails, but the thinking is that since fingers are more often exposed to the light than toes are, the fingernails grow faster. As ridiculous as it sounds, I can't discount this one out of hand.