Triangulation of self-report and investigator-rated coping indices as predictors of psychological stress: a longitudinal investigation among public utility workers.

The aims of the present study were to: (a) determine if self-reported coping is consistent with conceptually-equivalent investigator-rated coping indices; (b) establish which types of coping are associated with psychological stress; and (c) establish whether using investigator-rated in addition to self-report coping indices to predict stress outcomes is beneficial in a real life context of worker's stressors. To fulfil these aims, a longitudinal investigation was conducted among 40 Canadian workers from the public utility sector. Results from semi-structured interviews about their worst current stressors revealed main effects for some coping types as assessed with investigator-rated indices, whereas no main effects were observed with self-report coping indices. Still, self-report and investigator-rated coping indices together significantly predicted follow-up stress. Psychological stress was most strongly predicted by investigator-rated behavioural approach. While self-report cognitive approach predicted lower psychological stress, investigator-rated cognitive approach predicted greater stress. Findings underline the importance of using both types of coping indices to predict outcome.