Table 2.

Extraversion scale E₂₁ First principal component: Eigenvalue 5.60.

No.	Symptom	Loadings
1 (R)	Do you have many different hobbies?	0.29
5 (E)	Are you a talkative person?	0.62
10 (E)	Are you rather lively?	0.68
14 (R)	Can you usually let yourself go and enjoy yourself at a lively party?	0.57
17 (E)	Do you enjoy meeting new people?	0.53
21 (I)	Do you tend to keep in the background on social occasions?	−0.65
25 (R)	Do you like going out a lot?	0.27
29 (I)	Do you prefer reading to meeting people?	−0.31
32 (E)	Do you have many friends?	0.42
36 (R)	Would you call yourself happy-go-lucky?	0.31
40 (R)	Do you usually take the initiative in making new friends?	0.27
42 (I)	Are you mostly quiet when you are with other people?	−0.68
45 (R)	Can you easily get some life into a rather dull party?	0.53
49 (R)	Do you like telling jokes and funny stories to your friends?	0.45
52 (E)	Do you like mixing with people?	0.64
56 (R)	Do you nearly always have a “ready answer” when people talk to you?	0.49
60 (E)	Do you like doing things in which you have to act quickly?	0.50
64 (R)	Do you often take on more activities than you have time for?	0.27
70 (E)	Can you get a party going?	0.67
82 (E)	Do you like plenty of bustle and excitement around you?	0.55
86 (E)	Do other people think of you as being very lively	0.65

E: the nine items in E₉ (extraversion).

I: the three introversion items.

R: remaining extraversion items.