Correlation coefficients (standardized regression coefficients) representing the impact of the five personality traits on physical activity, obtained by linear regression comparing VLBW and control subjects (adjusted for sex and age).

Correlation coefficient is equal to a standardized regression coefficient: a 1 standard deviation unit higher score on a personality trait is associated with the correlation coefficient×standard deviation unit physical activity.VLBW = very low birth weight (aMET×hours of physical activity/year (MET = metabolic equivalents; ratio of metabolic rate during exercise and estimated metabolic rate at rest; 1 MET corresponds energy expenditure of approximately 1 kcal/kg×hour).bPcPdP