Table 4 Quality of trial data handling

Screening of titles and abstracts

1: one person

2-CH and 2-IN: see below^a

3: Unclear

2-IN

3

1

3

3

3

Assessment of full text for inclusion

2-IN

1

2-CH

3

3

3

Data extraction

2-IN

1

2-IN

2-IN

2-IN

2-IN

Assessment of study quality/risk of bias

2-IN

1

3

3

2-IN

2-IN

List of excluded trials?

0: No, 1: Yes

0

0

0

1^b

1

1

Reasons for exclusions of trials provided?

0: No, 1: Yes

1

0

1

1^b

1

1