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

Table 4 Number of supporting explanations in a category for reporting reasons for attrition

Category: reporting of reasons for attrition	N (%)
Reasons reported	1697 (16.5)
Reasons not reported	370 (3.6)
Inadequately reported	90 (0.9)
Total	2157 (21)