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The empathizing–systemizing (E–S) theory has been tested using the Empathy Quotient (EQ) and the Systemizing Quotient (SQ). The present study tested n=1761 students with these instruments, to determine if short versions of these scales could be constructed. This would be desirable both for faster assessment and to establish which are the key items on each scale. Principal component analysis and factor analysis suggested that a 22-item version of the EQ (EQ-Short) and a 25-item version of the SQ (SQ-Short) were highly correlated with the full scale versions. The reliability of each short scale was reasonable. Results showed that females scored significantly higher than males on the EQ-Short, whilst males scored higher than females on the SQ-Short. Additionally, scores were analyzed according to the degree the student was studying. On the EQ-Short, students studying humanities scored higher than …