A total of 34 randomized clinical trials (RCTs) involving
3922 patients were included (Table 1). Two thirds of the
studies involved somatization disorder (SD) (n 4 studies)
(20 –23) and lower threshold variants, such as abridged versions
of SD (n 9) (24 –32) and medically unexplained
symptoms (n 10) (33– 42).