Table 2 Key characteristics of 152 included studies

Number of GPs ^a

226 (304)

40

4–2155

31252

Number of scenarios ^b

18 (38)

4

2–390

2713

Number of scenarios per participant ^c

9 (13)

2

1–390

1319

Number of decisions per participant per scenario ^d

2 (1)

1

1–12

226