) in % compared to inconsistency (
) in % in seven meta-analyses (see Table 1) depicted as open circles. The open circles indicate that D
2 is always equal to or larger than I
2. 100% heterogeneity is impossible and the upper right point is just to illustrate that D
2 nears asymptotically to I
2 when heterogeneity nears 100%. Line of unity, D
2 = I
2 is the dotted blue line.