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Table 1 Choice of model in relation to the P-value for the heterogeneity test.

From: Dealing with substantial heterogeneity in Cochrane reviews. Cross-sectional study

  Newer reviews Older reviews
P Random Fixed Random Fixed
< 0.0001 6 0 2 6
[0.0001;0.001[ 2 1 2 1
[0.001;0.01[ 1 2 0 3
[0.01;0.05[ 7 4 1 4
[0.05;0.1[ 6 2 0 8
> = 0.1 0 0 0 2
Total 22 9 5 24
  1. Newer reviews are those updated after 1 June 2005 (n = 31). P = 0.007 for those reviews where the heterogeneity test yielded a P-value between 0.05 and 0.10