Table 2

The inconsistency in the illustrative examples
a) b) c) d) e)
Q df p Q df p Q df p Q df p Q df p
Qinc 9.17 3 0.027 7.50 3 0.058 11.67 3 0.009 4.17 1 0.041 16.67 10 0.082
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M93','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M93">View MathML</a> 0.00 2 1 6.82 2 0.033 6.82 2 0.033 0.00 0 1 0.00 9 1
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M94','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M94">View MathML</a> 5.36 2 0.069 5.36 2 0.069 0.00 2 1 15.62 9 0.075
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M95','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M95">View MathML</a> 15.62 9 0.075
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M96','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M96">View MathML</a> 15.62 9 0.075
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M97','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M97">View MathML</a> 8.33 2 0.016 0.00 2 1 8.33 2 0.016 0.00 0 1 15.62 9 0.075
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M98','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M98">View MathML</a> 0.00 2 1 6.82 2 0.033 6.82 2 0.033 0.00 0 1 15.62 9 0.075
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M99','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M99">View MathML</a> 15.62 9 0.075
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M100','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M100">View MathML</a> 15.62 9 0.075
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M101','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M101">View MathML</a> 15.62 9 0.075
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M102','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M102">View MathML</a> 8.33 2 0.016 0.00 2 1 8.33 2 0.016 0.00 0 1 16.67 9 0.054
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M103','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M103">View MathML</a> 16.67 9 0.054
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M104','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M104">View MathML</a> 16.67 9 0.054
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M105','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M105">View MathML</a> 9.09 2 0.011 6.82 2 0.033 11.36 2 0.003 0.00 0 1 16.67 9 0.054
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M106','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M106">View MathML</a> 8.93 2 0.012 5.36 2 0.069 10.71 2 0.005 16.67 9 0.054
<a onClick="popup('http://www.biomedcentral.com/1471-2288/13/35/mathml/M107','MathML',630,470);return false;" target="_blank" href="http://www.biomedcentral.com/1471-2288/13/35/mathml/M107">View MathML</a> 9.09 2 0.011 6.82 2 0.033 11.36 2 0.003 0.00 0 1 16.67 9 0.054

The Q statistic for inconsistency as well the Q statistic after detaching the effect of design d are given for each of the scenarios a) to e) in Figure 3. In addition, the degrees of freedom (df) of the corresponding chi-squared distribution and the p value (p) are shown.

Krahn et al.

Krahn et al. BMC Medical Research Methodology 2013 13:35   doi:10.1186/1471-2288-13-35

Open Data