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Table 2 Number of explanations in a category for percent of attrition per group

From: Assessments of attrition bias in Cochrane systematic reviews are highly inconsistent and thus hindering trial comparability

Category for percent of attrition per group

N (%)

Unclear

3272 (31.8)

Total attrition only mentioned; attrition per group not reported

1593 (15.5)

No attrition

1544 (15)

Only number of patients, no percent provided

1115 (10.8)

Not reported

901 (8.8)

No explanation for this category

414 (4)

10–20%

359 (3.5)

Above 30%

276 (2.7)

Under 10%

267 (2.6)

20–30%

216 (2.1)

Total attrition reported as percent; attrition per group reported as absolute numbers so it was not possible to judge percent attrition per group

248 (2.4)

Information about attrition provided for one group only

35 (0.3)

‘Support for judgment’ box was blank: no explanation provided for the judgment

27 (0.3)

Above certain percentage that is not precisely defined

13 (0.1)

Under certain percentage that is not 10%

6 (0.06)

There was no supporting explanation because RoB table did not have a domain for attrition bias at all

6 (0.06)

Total

10,292 (100)