Having an ingroup friend predicts greater acceptance of many outgroups

Evidence

The 3800 respondents rated how favorable they were toward eight outgroups, many of whom were not in their country. In all samples, significant relationships emerged even after seven variables were controlled. For each outgroup, those with intergroup friends were significantly more positive in their views. — Thomas F. Pettigrew, Intergroup Contact Theory, 74

Categorization

• QUESTION: What are the seven variables controlled, and were outgroups from other countries exposed to at all by respondents?