The Sobel Goodmann test was intended to be used to analyze the mediating role of RTWSE in the associations between baseline PA and work status at twelve months, using the three months level of RTWSE. These analyses were restricted to the cases of a statistically significant association between baseline PA and work status at twelve months (i.e., objective II). The Sobel Goodmann test was furthermore restricted to cases fulfilling the following preconditions to establish mediation: the independent variable (i.e., baseline PA) must significantly affect the mediator (i.e., RTWSE), and the mediator (i.e., RTWSE) must significantly affect the dependent variable (i.e., work status) [45]. These preconditions were tested using univariate logistic regression analyses.

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