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Table 1 Number of randomised controlled trials included in the data set, by risk of bias judgement

From: Empirical evidence of study design biases in nutrition randomised controlled trials: a meta-epidemiological study

Methodological trial characteristic

Risk of Bias judgement according to review authors

Total

Low

Unclear

High

N

N

%

N

%

N

%

Random sequence generation

831

618

74.4

205

24.7

8

0.9

Allocation concealment

925

541

58.5

370

40.0

14

1.5

Blinding of participants and personnel

430

264

61.4

88

20.5

78

18.1

Blinding of outcome assessment

500

348

69.6

136

27.2

16

3.2

Incomplete outcome data

872

583

66.9

149

17.1

140

16.0

Selective reporting

567

369

65.1

147

25.9

51

9.0

Dietary compliance

234

119

50.9

100

42.7

15

6.4