The relationship between political procedural justice and attitudes toward the political system: A meta-analysis

A positive relationship between assessments of procedural justice and attitudes toward the political system has been identified in many studies of various countries. To quantify this relationship, a meta-analysis was conducted on 69 samples from 50,814 respondents, reported in 37 manuscripts between 1981 and 2021. We found positive correlations between assessments of procedural justice and attitudes toward politicians, political institutions, and the political system in people of different ages and in countries with different political regimes. These positive correlations exist in real and hypothetical situations with various levels of authority. However, two factors moderated the association between the assessment of procedural justice and political attitudes. First, procedural justice as a set of norms is more strongly related to attitudes toward the system than procedural justice as a generalized assessment is. Second, the assessment of procedural justice is more strongly associated with attitudes toward political institutions and the system than attitudes toward the procedures and decisions. Moreover, the percentage of heterogeneity in the obtained models is fairly high; categorical moderators explain 43% of the variance of the effects obtained. The results should therefore be interpreted with consideration of this substantial heterogeneity in the correlations' sizes.