Table 4 Primary outcome(s) (n = 43 unless otherwise stated)

Primary outcome

Number of primary outcomes

 None

17

40

 1

15

35

 2

5

12

 3

3

7

 4

2

5

 5

0

0

 6

1

2

Type of outcome (n = 48)

 Pain

4

8

 Generic quality of life

2

4

 Disease-specific quality of life

14

29

 Treatment success

4

8

 Other patient-reported outcome

8

17

 Mortality, composite including mortality

2

4

 Process measure

8

17

 Functional measure

6

13

Valid observations (n = 26)^a, median (interquartile range), range