This meta-analysis investigated differences between nurses and physicians in interprofessional collaboration (IPC) ratings. Fifty-one surveys, representing a total of 18 782 professionals and students (13 132 nurses and nursing students, and 5650 physicians and medical students), were meta-analyzed, considering several moderating variables. Overall, nurses scored higher on IPC than physicians. Sensitivity analysis revealed that while physicians perceived more existing collaboration than nurses, nurses had a more positive attitude toward collaboration than physicians. Moreover, IPC ratings of nursing and medical students did not differ from those of practitioners. Finally, it appeared that interprofessional education interventions were able to reduce the difference in IPC between nurses and physicians.

In two experiments, the effect of (in)stability of status differences on the perception of perspective legitimacy and in-group threat among intermediate-status group members (i.e., nurses students or nurses) was analysed. Both studies indicated that in downwardly unstable condition, legitimacy was lower and in-group threat was higher than in stable condition. In upwardly unstable condition, perceived legitimacy was higher and in-group threat was lower than in stable condition. The indirect effects of (in)stability via in-group threat on perceived legitimacy were significant.

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Three experiments tested two competing hypotheses about the legitimacy of social systems among disadvantaged groups. The first hypothesis was derived from social identity theory, and assumes that perceived legitimacy is positively linked to group interest. The second hypothesis was drawn from system justification theory and states that perceived legitimacy is negatively linked to group interests. In Studies 1 (79 nursing students) and 2 (49 psychology students) participants believed that their in-group had either intermediate status (i.e., a disadvantaged group who might experience some advantages from the hierarchy) or low status in the hierarchy. They rated the legitimacy of general, national health, and intergroup hierarchy systems. Study 3 considered ingroup threat, and involved 101 nursing students. The results indicate that perceived legitimacy was generally higher in the intermediate-status condition than in the low-status condition. Ingroup threat was higher in the low-status condition, and partially mediated the effect of status on system justification. This paper contributes to knowledge about the mechanisms of legitimization of social hierarchies and social systems and suggests that disadvantaged groups are more likely to justify the social hierarchy if they derive some advantages from it. One way in which disadvantaged groups may derive social advantages from the hierarchy is by performing positive downward social comparisons, for example, an intermediate group comparing itself with a group lower in the hierarchy. It is argued that system justification may be used as an identity management strategy to avoid social identity threat.

Inter-professional collaboration is affected by the relationship between physicians and nurse at the professional group level. Managers who want to change and improve inter-professional collaboration should pay close attention to the interplay between changes they are introducing and well-established identities and practices between professionals.