The ratio of the lengths of the index finger and the ring finger in men may be an effective predictor of schizophrenia, scientists have found.

Turkish researchers found that the ratio of the lengths of the second digit (2D) and fourth digit (4D) may be predictive of a variety of disorders related to disturbed hormonal balance in males.

When the index finger is shorter than the ring finger, this results in a small 2D:4D ratio, pointing to a high exposure to testosterone in the uterus, researchers said.

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