Table 1 Clinical and demographic characteristics of OCD patients and HCs

Age (years, mean ± SD)^a

35.40 ± 12.07

39.70 ± 12.97

Gender (female/male)^b

20/20

26/14

Handedness (right/left)^b

37/3

39/1

Education (years, mean ± SD)^a

13.69 ± 2.43

15.15 ± 1.35

Illness duration (years, mean ± SD)

11.33 ± 10.10

Age of onset (years, mean ± SD)

23.98 ± 11.24

Total Y-BOCS (total score, mean ± SD)

21.95 ± 6.32

HDRS (17 items)^a

6.08 ± 6.87

0.55 ± 0.88

5-HTTLPR^a

 14/14

26

17

 14/16

13

22

 16/16

1

1

L_A allele carriers (SL_A, L_AL_G, L_AL_A)^b

10

20

Non-L_A allele carriers (SS, SL_G, L_GL_G)^b

30

20