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Table 1 Example of the potential clustering structure in FASTER

From: Assessing potential sources of clustering in individually randomised trials

Patient

Centre

Procedure

Surgeon

Rehab

Class attended

1

1

Dis

1

Y

A

2

1

Dis

1

N

-

3

1

Dis

2

Y

A

4

1

Dis

2

N

-

5

1

Dec

1

Y

B

6

1

Dec

1

N

-

8

1

Dec

2

Y

C

9

1

Dec

2

N

-

10

2

Dis

1

Y

A

11

2

Dis

1

N

-

12

2

Dec

3

Y

C

13

2

Dec

3

N

-

  1. Patients are randomised to either receive rehab or not. Patients are clustered within centre, and are stratified by the type of surgical procedure they receive. Surgeons operate across centres. Patients are able to choose which rehab class they attend.