你必须对这些结果有所保留，因为调查对象们倾向于给出他们认为应该给的答案。
You have to take these findings with a grain of salt because respondents tend to give the answers they feel they should.
从逻辑推理、反应速度和空间想象力三项测试的结果来看，调查对象的得分首次明显低于之前的最高水平是在27岁。
The first age at which performance was significantly lower than the peak scores was 27 – for three tests of reasoning, speed of thought and spatial visualisation.
另外调查者不询问调查对象是否有意在选举中投票也会导致预测结果不准确。
Pollsters may also have failed to predict a run-off because they did not ask whether respondents intended to vote.
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