A deep phenotyping approach to assess the association of handedness, early life factors and mental health.

We checked statistical assumptions of nominally significant ( p < 0.05) linear regression models (Parts 2 and 6) by means of visual inspection of the following residual plots: correct specification of the model (residuals vs. fitted values), normality of residuals (normal Q–Q), homoscedasticity of residuals (scale location) and existence of outliers or influential data points (residuals vs. leverage).

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Along these lines, the great majority of associations tested in the current study did not reach statistical significance at all.

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