Table 2

Result of a hand search for cluster randomised trials in the British Medical Journal

Year

Vol

Trials

Clustering ignored

Ignoring clustering judged as important

Found in Web of Science search

2003

326-7

9

0

0

5

1998

316-7

4

1(?)

1

0

1993

306-7

4

3

2

0

1988

296-7

0

0

0

0

1983

286-7

1

1

1

0

? doubtful whether clustering taken into account

Bland BMC Medical Research Methodology 2004 4:21   doi:10.1186/1471-2288-4-21