When we looked at their PSA levels -- which is a marker for prostate cancer -- they got worse in the control group, but they actually got better in the experimental group, and these differences were highly significant.
我们检查他们的PSA值（前列腺特异抗原）——一种衡量前列腺癌的数据， 控制组的人情况变差， 而实验组的情况却变好了， 而且两组差异是非常显著的。