江苏高考试题，求正确翻译！

　　Another study of 302 volunteers at hospitals in Chicago focused on individual differences in the degree to which people view “volunteer” as an important social role.

　　译文：另外一个对芝加哥的医院里的302个志愿者的研究关注人们在看待“志愿者”是社会里一个重要的部分的个人看法差异程度。

　　综上，to which 在这里确实是定语从句。
　　更准确的来说，在这个长句子里，Another study of 302 volunteers at hospitals in Chicago focused on individual differences in the degree 是主句， to which people view “volunteer” as an important social role 是从句。先行词是 the degree.
　　还有什么不懂的可以继续问我，希望采纳！

宾语从句。