Table 1.

Categories of interventions of included trials

Intervention category	Sample 1 (% reporting among sample of placebo-controlled trials published in top journals (n=94))	Sample 2 (% reporting among sample of placebo-controlled trials (n=100))	Sample 3 (% reporting among placebo-controlled trials that reported using TIDieR (n=6))
Pharmacological (e.g. placebo drug pill/injection)	90.4	61	-
Sham exercise	-	-	50
CAM (e.g. sham acupuncture, dietary/herbal supplements)	6.4	23	16.7
Sham physiotherapy	1.1	4	16.7
Sham laser treatment	-	3	16.7
Stimulation (e.g. sham rTMS)	-	3	-
Sham surgery	2.1	-	-
Other	-	6	-

Note: CAM= complementary and alternative medicine, rTMS = repetitive transcranial magnetic stimulation