variables were centered (except DV), because in social sciences zero is rarely a meaningful point on a scale (Cohen, Cohen, West, Aiken, 2006). for example in percieved social support questionnaire there is no value as zero. It is a Likert Type questionnaire and on questionnaire 1= strongly yes.....7= strongly no. So Aiken and West (1991), suggested to centered predictors and moderators to appoint zero a meaningful value to count in regression equation. also multilevel steps were run to avoid multicollinearity. according to results .05 were accepted as significant (in the coefficient table) and slope test were done for interactions. for plottin slopes unstandardised regression coefficient were used.
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