noun
individual differences; personal variation
Refers to variation between individuals in traits, responses, or performance. Common in medical, psychological, and educational contexts.
薬の効き目には個人差があります。
There are individual differences in how well the medicine works.
学習速度には大きな個人差が見られる。
Significant individual differences can be seen in learning speed.
Compound of 個人 (individual) and 差 (difference).