to include something when you are doing a calculation, or when you are trying to understand something

People are earning more, but when inflation is factored in, they are no better off. 人们挣得更多了，但将通货膨胀因素考虑在内，他们并没有比以前宽裕。

The age of the patients and their overall health must be factored into the results. 在评价治疗效果时，必须将患者的年龄和他们的整体健康状况等因素考虑进去。