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Table 2 Result of a hand search for cluster randomised trials in the British Medical Journal

From: Cluster randomised trials in the medical literature: two bibliometric surveys

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
  1. ? doubtful whether clustering taken into account