The influence of personality on quality of marriage was examined using causal modelling on a sample of 94 couples who had completed a quality of marriage scale and the revised short form of the Eysenck Personality Questionnaire. Irrespective of gender, quality of marriage was found to be influenced negatively by spouse's neuroticism, but the strongest influence on the quality of marriage of each spouse was the quality of marriage of the other. Altogether, the model accounted for over 60 per cent of the variance in quality of marriage, and provided an extremely close fit to the data. Finally, it was argued that valid conclusions about marital quality can only be derived from couples rather than from married individuals.
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Russell et al. (1994) studied this question.