| 21. | In a Norwegian twin study, the heritability of self-efficacy in adolescents was estimated at 75 percent.
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| 22. | His fields of research being psychopathology and personality psychology, he is known for employing twin studies.
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| 23. | The twin study did not confirm this.
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| 24. | The Neubauer study differs from all other twin studies in that it followed the twins from infancy.
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| 25. | In so doing he anticipated the modern field of behaviour genetics, which relies heavily on twin studies.
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| 26. | Another source of data indicating a significant biological aspect of some mental health disorders is twin studies.
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| 27. | This 1973 twin study, " failed to provide convincing evidence of a genetic component in creativity ".
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| 28. | In addition to the twin study method, scholars have used gene association studies to analyze voter turnout.
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| 29. | Twin studies and family association studies have demonstrated that there are definite genetic factors underlying obsessive-compulsive disorder.
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| 30. | However, this may be an overestimation, as new twin studies estimate the heritability at between 60-90 %.
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