请英语大神帮我翻译下这句话···

To testwhether the reduction in the variance accounted for byexperimental condition (on generalized prejudice)when it is considered alone (β = .41, p < .001) compared to when perceived intergroup improvement is taken intoaccount (β = .11, ns) is a significant one, a z test was performed(see Kenny, 1998).

谢谢

这是一篇关于群体偏见的文章吗？试着翻译了一下，可能不太准确，权当抛砖引玉吧：

我们首先单独考虑实验条件（泛化的偏见）造成的差异(β = .41, p < .001)，如果把觉察到的群际改善纳入考虑，则差异(β = .11, ns)有所增长，为了检验这个增长是否显著，采用了Z检验（见Kenny，1998）。

ps：我觉得perceived intergroup improvement可能要结合上下文才能找到比较通顺的译法。