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Table 2 Article Characteristics (N = 544)

From: Reporting of flow diagrams in randomised controlled trials published in periodontology and implantology: a survey

Characteristics

n

%

Journal

  Periodontology

258

47%

  Implantology

286

53%

Dental specialty

  Periodontology

171

31%

  Implantology

373

69%

Pilot Study

 Yes

26

5%

 No

518

95%

Design

 Parallel

444

82%

 Split-mouth

84

15%

 Crossover

9

2%

 Other

4

1%

 Parallel and split-mouth

3

1%

Type of intervention

 Interventional RCT

544

100%

Type of procedure

 Surgical

431

79%

 Non-surgical

113

21%

Centre

 Single-centre

464

85%

 Multi-centre

80

15%

Number of treatment arms

 2

464

85%

 3

59

11%

 4

19

3%

 5

1

0.5%

 8

1

0.5%

CONSORT endorsement

 Yes

315

58%

 No

229

42%

Funding

 Non-profit organization

174

32%

 Profit organization

221

41%

 Self-funded

45

8%

 Not reported

104

19%

Conflict of interest

 Reported

516

95%

 Not reported

28

5%

Statistical results

 Significant results

432

79%

 Non-significant results

112

21%

Registration

 Registered

316

58%

 Not registered

228

42%

Statistician

 Statistician involved

115

21%

 Statistician not involved

429

79%

Country

  USA

63

12%

  Italy

59

11%

  Brasil

54

10%

  Switzerland

33

6%

  Spain

33

6%

  China

30

6%

  Germany

28

5%

  Turkey

23

4%

  Egypt

22

4%

  Netherlands

19

3%

Top 10 countries

364

67%

Remaining countries

180

33%

Continent

 Africa

27

5%

 Asia

134

25%

 Australia

4

1%

 Europe

255

47%

 North America

67

12%

 South America

57

10%

Ethics board approval

 Reported

526

97%

 Not reported

18

3%

Flow diagram

 Reported

317

58%

 Not reported

227

42%

Flow diagram (where reported)

 Main text

294

93%

 Additional information

23

7%

Type of analysis

 Intention-to-treat

54

10%

 Per Protocol

14

3%

 Not reported

460

84%

 Intention-to-treat and per

 protocol

16

3%

Characteristics

Median

IQR

 Number of authors

6

2

 Sample size

36

29