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Perceptions of Alikeness and Attitudes toward Being a Twin: Comparison of Identical and Fraternal Twin Pairs

A 10-item yes-no questionnaire designed to gather data on similarities between twins in various areas of interest and activity was administered to 63 pairs of like-sexed identical twins and 54 pairs of like-sexed fraternal twins. One open-ended question tapped attitudes toward being a twin. On 8 of the 10 objective questions, the identical twins showed significantly greater similarity than the fraternal twins. An analysis of the attitudes expressed on the open-ended question classified as predominantly positive, negative, or ambivalent indicated that zygosity does not make a difference in attitudes toward being a twin. A larger, but statistically non-significant amount of intrapair disagreement in the fraternal group, contrasted with that for the identicals.