The correlations for personality traits within nonidentical twins range from approximately 0.6 to 0.8.
Consequently, even if they share the same DNA at birth, identical twins are likely to develop different personalities in the same environment, partly as a result of how they engage with that environment. According to twin research on the heritability of personality, genetic variances account for somewhere between 15% and 55% of the overall variation in human personalities.
Although there may be a correlation between two or more variables (such as those negative thoughts and depressed symptoms), this correlation does not always imply causation. Correlation between two variables simply indicates that when one changes, the other does also.
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