Type of intervention and placebo. Values are number of trials


 General medicine
 Psychiatry
Type of intervention*

Pharmacological
83
89
Surgical
0
0
Behavioural
1
2
Device
0
3
Physiotherapeutic
3
0
Nutritional supplement
9
0
Other
4
3
Total
100
97
Type of placebo{dagger}

Not reported
16
38
Capsule
18
28
Tablet
20
16
Injection
23
5
Sham device
2
1
Sham procedure
2
0
Oral solution
9
3
Inhaler
2
0
Other
9
3
Total
101
94

* 3 trials in general medicine and 3 trials in psychiatry had more than one intervention.

{dagger} 4 trials in general medicine and 1 trial in psychiatry had more than one type of placebo.