Skip to main content

Table 3 Overview of the design of the choice tasks among included studies

From: Vaccine preferences driving vaccine-decision making of different target groups: a systematic review of choice-based experiments

Aspect

Specification

Number of studies (%)

Methods to identify attributesa

Characteristics vaccine, disease

2 (4.8)

Expert consultation

19 (45.2)

Literature review

33 (78.6)

Previous DCE

4 (9.5)

Qualitative research

28 (66.7)

Theories vaccine decision-making

1 (2.4)

Vaccination policy

1 (2.4)

Not reported

1 (2.4)

Choice structure

Binary

3 (7.1)

Multinomial

39 (92.9)

Methods to create choice sets, of multinomial studies (n = 39)a

D-efficiency

3 (7.7)

D-efficiency using software

11 (28.2)

Fold-over

3 (7.7)

Random

3 (7.7)

Random using software

1 (2.6)

Other software

5 (12.8)

Not reported

13 (33.3)

Format of choice question, of multinomial studies (n = 39)b

Forced choice

4 (10.3)

Forced choice, followed by opt-out

12 (30.8)

Unforced choice with opt-out

18 (46.2)

Unforced choice with opt-out, followed by forced choice

2 (5.1)

Unclear

3 (7.7)

Number of choice tasks

< 10

17 (40.5)

10–15

10 (23.8)

> 15

10 (23.8)

Not reported

5 (11.9)

  1. aAs multiple methods could be used to identify attributes, the total number of studies exceeds the total amount of included studies (and 100%); bNote the proportion (%) is calculated from studies applying multinomial choice structures (n = 39), not from the total amount of studies (n = 42)