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Table 4 Questionnaire on participants’ impression of the informed consent process

From: Participants’ understanding of a randomized controlled trial (RCT) through informed consent procedures in the RCT for breast cancer screening, J-START

Item

Categories

N

%

Prior knowledge

   

Did you know about “RCTs” before participating in J-START?

Yes

108

28.7

No

268

71.3

Did you know about J-START before the informed consent procedure?

Yes

97

25.8

No

279

74.2

Helpfulness of media

   

Did the information leaflet help you understand J-START?

Helpful

266

70.7

Unsure

62

16.5

No

48

12.8

Did the educational video help you understand J-START?

Helpful

277

73.7

Unsure

25

6.7

No

74

19.7

Evaluations of the verbal delivery of the information during the informed consent procedure

Did the research staff confirm your understanding?

Yes

346

92.0

Unsure

17

4.5

No

9

2.4

Missing

4

1.1

Did you need further information?

Yes

10

2.7

Unsure

58

15.4

No

299

79.5

Missing

9

2.4

I had sufficient opportunity to ask questions

Yes

338

89.9

Unsure

14

3.7

No

20

5.3

Missing

4

1.1

I had enough time to understand information

Yes

259

68.9

Unsure

102

27.1

No

12

3.2

Missing

3

0.8

Did you find it easy to refuse participation?

Yes

285

75.8

Unsure

60

16.0

No

23

6.1

Missing

8

2.1

  1. J-START, Japan STrategic Anti-cancer Randomized controlled Trial; RCT, randomized controlled trial.